Denial of Service Vulnerability in Cisco IOS and Secure Firewall Products
CVE-2026-20012

8.6HIGH

Key Information:

Vendor

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

Badges

👾 Exploit Exists

What is CVE-2026-20012?

A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS and Secure Firewall products could be exploited by an unauthenticated remote attacker. This vulnerability stems from improper parsing of IKEv2 packets, allowing the attacker to send specially crafted packets to the affected device. A successful exploitation may lead to a memory leak, causing the device to become unstable or fully reload, resulting in a denial of service condition. Users may experience an inability to establish new IKEv2 VPN sessions, and a manual reboot of the device is necessary to restore functionality.

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Affected Version(s)

Cisco IOS XE Software 3.5.0E

Cisco IOS XE Software 3.5.1E

Cisco IOS XE Software 3.5.2E

References

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

CVSS V3.1

Score:
8.6
Severity:
HIGH
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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