DoS Vulnerability in Cisco Secure Firewall ASA and FTD Software
CVE-2026-20013

5.8MEDIUM

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-2026-20013?

A vulnerability exists in the IKEv2 feature of Cisco Secure Firewall ASA and FTD Software that allows unauthenticated remote attackers to induce a denial of service condition. This is caused by memory exhaustion resulting from improper handling of IKEv2 packets. An attacker can exploit this flaw by transmitting specially crafted IKEv2 packets, potentially exhausting the device's resources and necessitating a manual reboot to restore service. The issue poses risks not only to the affected devices but may also impact overall network availability.

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Affected Version(s)

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3

References

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

CVSS V3.1

Score:
5.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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