Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Heap Overflow Denial of Service Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-20053
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-04 18:16:19 UTC
Updated2026-08-20 15:26:08 UTC
DescriptionMultiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.

Risk And Classification

Primary CVSS: v3.1 5.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

EPSS: 0.004140000 probability, percentile 0.347040000 (date 2026-08-23)

Problem Types: CWE-122 | CWE-122 Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
3.1CNACVSSV3_15.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cisco Cyber Vision 3.0.0 All All All
Application Cisco Cyber Vision 3.0.1 All All All
Application Cisco Cyber Vision 3.0.2 All All All
Application Cisco Cyber Vision 3.0.3 All All All
Application Cisco Cyber Vision 3.0.4 All All All
Application Cisco Cyber Vision 3.0.5 All All All
Application Cisco Cyber Vision 3.0.6 All All All
Application Cisco Cyber Vision 3.1.0 All All All
Application Cisco Cyber Vision 3.1.1 All All All
Application Cisco Cyber Vision 3.1.2 All All All
Application Cisco Cyber Vision 3.2.0 All All All
Application Cisco Cyber Vision 3.2.1 All All All
Application Cisco Cyber Vision 3.2.2 All All All
Application Cisco Cyber Vision 3.2.3 All All All
Application Cisco Cyber Vision 3.2.4 All All All
Application Cisco Cyber Vision 4.0.0 All All All
Application Cisco Cyber Vision 4.0.1 All All All
Application Cisco Cyber Vision 4.0.2 All All All
Application Cisco Cyber Vision 4.0.3 All All All
Application Cisco Cyber Vision 4.1.0 All All All
Application Cisco Cyber Vision 4.1.1 All All All
Application Cisco Cyber Vision 4.1.2 All All All
Application Cisco Cyber Vision 4.1.3 All All All
Application Cisco Cyber Vision 4.1.4 All All All
Application Cisco Cyber Vision 4.1.5 All All All
Application Cisco Cyber Vision 4.1.6 All All All
Application Cisco Cyber Vision 4.1.7 All All All
Application Cisco Cyber Vision 4.2.0 All All All
Application Cisco Cyber Vision 4.2.1 All All All
Application Cisco Cyber Vision 4.2.2 All All All
Application Cisco Cyber Vision 4.2.3 All All All
Application Cisco Cyber Vision 4.2.4 All All All
Application Cisco Cyber Vision 4.2.6 All All All
Application Cisco Cyber Vision 4.3.0 All All All
Application Cisco Cyber Vision 4.3.1 All All All
Application Cisco Cyber Vision 4.3.2 All All All
Application Cisco Cyber Vision 4.3.3 All All All
Application Cisco Cyber Vision 4.4.0 All All All
Application Cisco Cyber Vision 4.4.1 All All All
Application Cisco Cyber Vision 4.4.2 All All All
Application Cisco Cyber Vision 4.4.3 All All All
Application Cisco Cyber Vision 5.0.0 All All All
Application Cisco Cyber Vision 5.0.1 All All All
Application Cisco Cyber Vision 5.0.2 All All All
Application Cisco Cyber Vision 5.1.0 All All All
Application Cisco Cyber Vision 5.1.1 All All All
Application Cisco Cyber Vision 5.1.2 All All All
Application Cisco Cyber Vision 5.1.3 All All All
Application Cisco Cyber Vision 5.2.0 All All All
Application Cisco Cyber Vision 5.2.1 All All All
Application Cisco Cyber Vision 5.3.0 All All All
Application Cisco Cyber Vision 5.3.1 All All All
Application Cisco Cyber Vision 5.3.2 All All All
Application Cisco Secure Firewall Threat Defense 7.2.0 All All All
Application Cisco Secure Firewall Threat Defense 7.2.0.1 All All All
Application Cisco Secure Firewall Threat Defense 7.2.1 All All All
Application Cisco Secure Firewall Threat Defense 7.2.10 All All All
Application Cisco Secure Firewall Threat Defense 7.2.10.2 All All All
Application Cisco Secure Firewall Threat Defense 7.2.2 All All All
Application Cisco Secure Firewall Threat Defense 7.2.3 All All All
Application Cisco Secure Firewall Threat Defense 7.2.4 All All All
Application Cisco Secure Firewall Threat Defense 7.2.4.1 All All All
Application Cisco Secure Firewall Threat Defense 7.2.5 All All All
Application Cisco Secure Firewall Threat Defense 7.2.5.1 All All All
Application Cisco Secure Firewall Threat Defense 7.2.5.2 All All All
Application Cisco Secure Firewall Threat Defense 7.2.6 All All All
Application Cisco Secure Firewall Threat Defense 7.2.7 All All All
Application Cisco Secure Firewall Threat Defense 7.2.8 All All All
Application Cisco Secure Firewall Threat Defense 7.2.8.1 All All All
Application Cisco Secure Firewall Threat Defense 7.2.9 All All All
Application Cisco Secure Firewall Threat Defense 7.3.0 All All All
Application Cisco Secure Firewall Threat Defense 7.3.1 All All All
Application Cisco Secure Firewall Threat Defense 7.3.1.1 All All All
Application Cisco Secure Firewall Threat Defense 7.3.1.2 All All All
Application Cisco Secure Firewall Threat Defense 7.4.0 All All All
Application Cisco Secure Firewall Threat Defense 7.4.1 All All All
Application Cisco Secure Firewall Threat Defense 7.4.1.1 All All All
Application Cisco Secure Firewall Threat Defense 7.4.2 All All All
Application Cisco Secure Firewall Threat Defense 7.4.2.1 All All All
Application Cisco Secure Firewall Threat Defense 7.4.2.2 All All All
Application Cisco Secure Firewall Threat Defense 7.4.2.3 All All All
Application Cisco Secure Firewall Threat Defense 7.4.2.4 All All All
Application Cisco Secure Firewall Threat Defense 7.4.3 All All All
Application Cisco Secure Firewall Threat Defense 7.6.0 All All All
Application Cisco Secure Firewall Threat Defense 7.6.1 All All All
Application Cisco Secure Firewall Threat Defense 7.6.2 All All All
Application Cisco Secure Firewall Threat Defense 7.6.2.1 All All All
Application Cisco Secure Firewall Threat Defense 7.7.0 All All All
Application Cisco Secure Firewall Threat Defense 7.7.10 All All All
Application Cisco Secure Firewall Threat Defense 7.7.10.1 All All All
Application Cisco Snort All All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.1a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.2 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.3 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.3a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.4 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.4a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.4b All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.5 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.5a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.5b All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.5c All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.5d All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.12.6 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.13.1a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.14.1a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.1a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.2a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.2c All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.3 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.3a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.4 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.15.4c All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.16.1a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.17.1 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.18.1 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.18.1a All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.18.2 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.9.4 All All All
Operating System Cisco Unified Threat Defense Snort Intrusion Prevention System Engine 17.9.5e All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cisco Cisco Cyber Vision affected 3.0.0 Not specified
CNA Cisco Cisco Cyber Vision affected 3.0.2 Not specified
CNA Cisco Cisco Cyber Vision affected 3.0.3 Not specified
CNA Cisco Cisco Cyber Vision affected 3.0.1 Not specified
CNA Cisco Cisco Cyber Vision affected 3.1.0 Not specified
CNA Cisco Cisco Cyber Vision affected 3.0.4 Not specified
CNA Cisco Cisco Cyber Vision affected 3.1.1 Not specified
CNA Cisco Cisco Cyber Vision affected 3.1.2 Not specified
CNA Cisco Cisco Cyber Vision affected 3.2.0 Not specified
CNA Cisco Cisco Cyber Vision affected 3.0.5 Not specified
CNA Cisco Cisco Cyber Vision affected 3.2.1 Not specified
CNA Cisco Cisco Cyber Vision affected 3.0.6 Not specified
CNA Cisco Cisco Cyber Vision affected 3.2.2 Not specified
CNA Cisco Cisco Cyber Vision affected 3.2.3 Not specified
CNA Cisco Cisco Cyber Vision affected 3.2.4 Not specified
CNA Cisco Cisco Cyber Vision affected 4.0.0 Not specified
CNA Cisco Cisco Cyber Vision affected 4.0.1 Not specified
CNA Cisco Cisco Cyber Vision affected 4.0.2 Not specified
CNA Cisco Cisco Cyber Vision affected 4.0.3 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.0 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.1 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.2 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.3 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.4 Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.0 Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.1 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.5 Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.2 Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.X Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.3 Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.4 Not specified
CNA Cisco Cisco Cyber Vision affected 4.2.6 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.6 Not specified
CNA Cisco Cisco Cyber Vision affected 4.3.0 Not specified
CNA Cisco Cisco Cyber Vision affected 4.3.1 Not specified
CNA Cisco Cisco Cyber Vision affected 4.3.2 Not specified
CNA Cisco Cisco Cyber Vision affected 4.3.3 Not specified
CNA Cisco Cisco Cyber Vision affected 4.4.0 Not specified
CNA Cisco Cisco Cyber Vision affected 4.4.1 Not specified
CNA Cisco Cisco Cyber Vision affected 4.4.2 Not specified
CNA Cisco Cisco Cyber Vision affected 4.4.3 Not specified
CNA Cisco Cisco Cyber Vision affected 4.1.7 Not specified
CNA Cisco Cisco Cyber Vision affected 5.0.0 Not specified
CNA Cisco Cisco Cyber Vision affected 5.0.1 Not specified
CNA Cisco Cisco Cyber Vision affected 5.0.2 Not specified
CNA Cisco Cisco Cyber Vision affected 5.1.0 Not specified
CNA Cisco Cisco Cyber Vision affected 5.1.1 Not specified
CNA Cisco Cisco Cyber Vision affected 5.1.2 Not specified
CNA Cisco Cisco Cyber Vision affected 5.1.3 Not specified
CNA Cisco Cisco Cyber Vision affected 5.2.0 Not specified
CNA Cisco Cisco Cyber Vision affected 5.2.1 Not specified
CNA Cisco Cisco Cyber Vision affected 5.3.0 Not specified
CNA Cisco Cisco Cyber Vision affected 5.3.1 Not specified
CNA Cisco Cisco Cyber Vision affected 5.3.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.0 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.0.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.3.0 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.3 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.3.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.4 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.5 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.4.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.3.1.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.0 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.5.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.6 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.1.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.7 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.5.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.3.1.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.8 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.6.0 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.8.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.2.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.9 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.7.0 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.2.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.10 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.6.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.2.3 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.6.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.7.10 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.6.2.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.7.10.1 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.2.4 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.2.10.2 Not specified
CNA Cisco Cisco Secure Firewall Threat Defense FTD Software affected 7.4.3 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.1a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.9.4 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.2 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.13.1a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.3 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.14.1a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.4 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.3a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.1a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.16.1a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.9.5e Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.4a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.2c Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.4b Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.2a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.5 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.17.1 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.5a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.3a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.3 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.5b Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.5c Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.4 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.18.1 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.18.1a Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.6 Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.15.4c Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.12.5d Not specified
CNA Cisco Cisco UTD SNORT IPS Engine Software affected 17.18.2 Not specified

References

ReferenceSourceLinkTags
sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-sn... [email protected] sec.cloudapps.cisco.com Vendor Advisory, Mitigation
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Exploits

CNA: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

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