CVE-2023-20244

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Summary

CVECVE-2023-20244
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-11-01 17:15:11 UTC
Updated2026-08-11 19:33:44 UTC
DescriptionA vulnerability in the internal packet processing of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Firewalls could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain packets when they are sent to the inspection engine. An attacker could exploit this vulnerability by sending a series of crafted packets to an affected device. A successful exploit could allow the attacker to deplete all 9,472 byte blocks on the device, resulting in traffic loss across the device or an unexpected reload of the device. If the device does not reload on its own, a manual reload of the device would be required to recover from this state.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

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

EPSS: 0.007740000 probability, percentile 0.525100000 (date 2026-08-12)

Problem Types: CWE-771 | NVD-CWE-noinfo | CWE-771 Missing Reference to Active Allocated Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1CNACVSSV3_18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Cisco Firepower 2110 - All All All
Hardware Cisco Firepower 2120 - All All All
Hardware Cisco Firepower 2130 - All All All
Hardware Cisco Firepower 2140 - All All All
Application Cisco Secure Firewall Threat Defense 6.2.3 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.1 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.10 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.11 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.12 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.13 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.14 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.15 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.16 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.17 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.18 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.2 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.3 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.4 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.5 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.6 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.7 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.8 All All All
Application Cisco Secure Firewall Threat Defense 6.2.3.9 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.1 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.10 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.11 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.12 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.13 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.14 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.15 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.16 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.2 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.3 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.4 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.5 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.6 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.7 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.8 All All All
Application Cisco Secure Firewall Threat Defense 6.4.0.9 All All All
Application Cisco Secure Firewall Threat Defense 6.6.0 All All All
Application Cisco Secure Firewall Threat Defense 6.6.0.1 All All All
Application Cisco Secure Firewall Threat Defense 6.6.1 All All All
Application Cisco Secure Firewall Threat Defense 6.6.3 All All All
Application Cisco Secure Firewall Threat Defense 6.6.4 All All All
Application Cisco Secure Firewall Threat Defense 6.6.5 All All All
Application Cisco Secure Firewall Threat Defense 6.6.5.1 All All All
Application Cisco Secure Firewall Threat Defense 6.6.5.2 All All All
Application Cisco Secure Firewall Threat Defense 6.6.7 All All All
Application Cisco Secure Firewall Threat Defense 6.6.7.1 All All All
Application Cisco Secure Firewall Threat Defense 6.7.0 All All All
Application Cisco Secure Firewall Threat Defense 6.7.0.1 All All All
Application Cisco Secure Firewall Threat Defense 6.7.0.2 All All All
Application Cisco Secure Firewall Threat Defense 6.7.0.3 All All All
Application Cisco Secure Firewall Threat Defense 7.0.0 All All All
Application Cisco Secure Firewall Threat Defense 7.0.0.1 All All All
Application Cisco Secure Firewall Threat Defense 7.0.1 All All All
Application Cisco Secure Firewall Threat Defense 7.0.1.1 All All All
Application Cisco Secure Firewall Threat Defense 7.0.2 All All All
Application Cisco Secure Firewall Threat Defense 7.0.2.1 All All All
Application Cisco Secure Firewall Threat Defense 7.0.3 All All All
Application Cisco Secure Firewall Threat Defense 7.0.4 All All All
Application Cisco Secure Firewall Threat Defense 7.0.5 All All All
Application Cisco Secure Firewall Threat Defense 7.1.0 All All All
Application Cisco Secure Firewall Threat Defense 7.1.0.1 All All All
Application Cisco Secure Firewall Threat Defense 7.1.0.3 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 7.2.2 All All All
Application Cisco Secure Firewall Threat Defense 7.2.3 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.2 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.4 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.5 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.6 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.7 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.8 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.10 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.11 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.9 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.12 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.13 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.14 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.15 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.16 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.17 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.2.3.18 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.4 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.5 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.5.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.5.2 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.7 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.6.7.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.2 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.4 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.5 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.6 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.7 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.8 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.9 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.10 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.11 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.12 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.13 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.14 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.15 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.4.0.16 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.7.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.7.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.7.0.2 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 6.7.0.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.1.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.2 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.2.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.4 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.0.5 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.1.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.1.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.1.0.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.2.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.2.0.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.2.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.2.2 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.2.3 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.3.0 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.3.1 Not specified
CNA Cisco Cisco Firepower Threat Defense Software affected 7.3.1.1 Not specified

References

ReferenceSourceLinkTags
Cisco Firepower Threat Defense Software for Cisco Firepower 2100 Series Firewalls Inspection Rules Denial of Service Vulnerability af854a3a-2127-422b-91ae-364da2661108 sec.cloudapps.cisco.com Vendor Advisory
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 Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

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