Cisco Firepower Threat Defense Software VPN System Logging Denial of Service Vulnerability

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Summary

CVECVE-2020-3189
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-05-06 17:15:12 UTC
Updated2026-08-11 19:33:44 UTC
DescriptionA vulnerability in the VPN System Logging functionality for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a memory leak that can deplete system memory over time, which can cause unexpected system behaviors or device crashes. The vulnerability is due to the system memory not being properly freed for a VPN System Logging event generated when a VPN session is created or deleted. An attacker could exploit this vulnerability by repeatedly creating or deleting a VPN tunnel connection, which could leak a small amount of system memory for each logging event. A successful exploit could allow the attacker to cause system memory depletion, which can lead to a systemwide denial of service (DoS) condition. The attacker does not have any control of whether VPN System Logging is configured or not on the device, but it is enabled by default.

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: 0.017950000 probability, percentile 0.764300000 (date 2026-08-12)

Problem Types: CWE-400 | CWE-401 | CWE-400 CWE-400

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
3.0[email protected]Secondary8.6HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.0CNADECLARED8.6HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

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

CVSS v3.0 Breakdown

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

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Cisco Asa 5505 - All All All
Operating System Cisco Asa 5505 Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5505 Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5505 Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5505 Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5510 - All All All
Operating System Cisco Asa 5510 Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5510 Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5510 Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5510 Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5512-x - All All All
Operating System Cisco Asa 5512-x Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5512-x Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5512-x Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5512-x Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5515-x - All All All
Operating System Cisco Asa 5515-x Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5515-x Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5515-x Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5515-x Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5520 - All All All
Operating System Cisco Asa 5520 Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5520 Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5520 Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5520 Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5525-x - All All All
Operating System Cisco Asa 5525-x Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5525-x Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5525-x Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5525-x Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5540 - All All All
Operating System Cisco Asa 5540 Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5540 Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5540 Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5540 Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5545-x - All All All
Operating System Cisco Asa 5545-x Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5545-x Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5545-x Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5545-x Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5550 - All All All
Operating System Cisco Asa 5550 Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5550 Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5550 Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5550 Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5555-x - All All All
Operating System Cisco Asa 5555-x Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5555-x Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5555-x Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5555-x Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5580 - All All All
Operating System Cisco Asa 5580 Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5580 Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5580 Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5580 Firmware 9.9\(2\) All All All
Hardware Cisco Asa 5585-x - All All All
Operating System Cisco Asa 5585-x Firmware 9.9\(2.21\) All All All
Operating System Cisco Asa 5585-x Firmware 9.9\(2.52\) All All All
Operating System Cisco Asa 5585-x Firmware 9.9\(2.55\) All All All
Operating System Cisco Asa 5585-x Firmware 9.9\(2\) 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cisco Cisco Firepower Threat Defense Software affected n/a Not specified

References

ReferenceSourceLinkTags
Cisco Firepower Threat Defense Software VPN System Logging Denial of Service Vulnerability af854a3a-2127-422b-91ae-364da2661108 tools.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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