Denial of Service Vulnerability in Cisco Secure Firewall Products
CVE-2026-20049

7.7HIGH

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Adaptive Security Appliance (asa) Software
Cisco Secure Firewall Threat Defense (ftd) Software
Vendor
CVE Published:
4 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20049?

A vulnerability exists in the Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic processing of Cisco Secure Firewall ASA and FTD software. This vulnerability can be exploited by an authenticated remote attacker who sends crafted GCM-encrypted IPsec traffic to the affected device. Due to inadequate memory allocation, a successful exploitation may lead to an unexpected device reload, resulting in a denial of service condition. The attacker must have valid credentials to establish a VPN connection with the device to exploit this issue.

Affected Version(s)

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.7

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.10

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.4.13

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.