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Servers and applications

CVE-2025-20127

A vulnerability in the TLS 1.3 implementation for a specific cipher for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Firepower 3100 and 4200 Series devices could allow an authenticated, remote attacker to consume resources that are associated with incoming TLS 1.3 connections, which eventually could cause the…

Severity
High 7.7
Published
14 Aug 2025
Last changed
11 Aug 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • Version 9.22.1.1
  • Version 9.20.3.7
  • Version 9.20.3.4
  • Version 9.20.3
All 10 release lines
  • Version 9.20.1
  • Version 9.20.1.5
  • Version 9.20.2
  • Version 9.20.2.10
  • Version 9.20.2.21
  • Version 9.20.2.22
  • Version 9.20.3
  • Version 9.20.3.4
  • Version 9.20.3.7
  • Version 9.22.1.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-20127
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-20127