Riskcovery

CVE-2026-20154

Cisco Secure Firewall Adaptive Security Appliance Software and Secure Firewall Threat Defense Software Logging Denial of Service

State
Published
Severity
8.6 High
Published
Sep 16, 2026
Updated
Sep 18, 2026
Reserved
Oct 8, 2025

Read the record on cve.org

Description

A vulnerability in the system rate-limiting process for syslog message 419002 of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization on an affected device, resulting in a denial of service (DoS) condition.

This vulnerability is due to improper rate limiting for syslog message 419002. An attacker could exploit this vulnerability by sending a flood of TCP synchronization (SYN) packets to an affected device. A successful exploit could allow the attacker to cause high CPU utilization, resulting in performance degradation. 

Scores

CVSSScoreVectorSource
3.18.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hcisco

Weaknesses

  • CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

ProductVersions
Cisco Secure Firewall Adaptive Security Appliance (ASA) SoftwareCisco
  • 9.16.1Affected
  • 9.16.1.28Affected
  • 9.16.2Affected
  • 9.16.2.3Affected
  • 9.16.2.7Affected
  • 9.16.2.11Affected
  • 9.16.2.13Affected
  • 9.16.2.14Affected
  • 9.16.3.3Affected
  • 9.16.3Affected
  • 9.16.3.14Affected
  • 9.18.1Affected
  • 9.16.3.15Affected
  • 9.18.1.3Affected
  • 9.18.2Affected
  • 9.16.3.19Affected
  • 9.16.3.23Affected
  • 9.18.2.5Affected
  • 9.16.4Affected
  • 9.18.2.7Affected
  • 9.19.1Affected
  • 9.16.4.9Affected
  • 9.18.2.8Affected
  • 9.16.4.14Affected
  • 9.18.3Affected
  • and 85 more versions
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco
  • 7.0.0Affected
  • 7.0.0.1Affected
  • 7.0.1Affected
  • 7.0.1.1Affected
  • 7.0.2Affected
  • 7.2.0Affected
  • 7.0.2.1Affected
  • 7.0.3Affected
  • 7.2.0.1Affected
  • 7.0.4Affected
  • 7.2.1Affected
  • 7.0.5Affected
  • 7.3.0Affected
  • 7.2.2Affected
  • 7.2.3Affected
  • 7.3.1Affected
  • 7.2.4Affected
  • 7.0.6Affected
  • 7.2.5Affected
  • 7.2.4.1Affected
  • 7.3.1.1Affected
  • 7.4.0Affected
  • 7.0.6.1Affected
  • 7.2.5.1Affected
  • 7.4.1Affected
  • and 31 more versions

References

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