Riskcovery

CVE-2026-20012

State
Published
Severity
8.6 High
Published
Mar 25, 2026
Updated
Mar 26, 2026
Reserved
Oct 8, 2025

Read the record on cve.org

Description

A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.

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-401 Missing Release of Memory after Effective Lifetime

Affected Products

ProductVersions
IOSCisco
  • 15.2(1)SAffected
  • 15.2(2)SAffected
  • 15.2(1)S1Affected
  • 15.2(4)SAffected
  • 15.2(1)S2Affected
  • 15.2(2)S1Affected
  • 15.2(2)S2Affected
  • 15.2(2)S0aAffected
  • 15.2(2)S0cAffected
  • 15.2(4)S1Affected
  • 15.2(4)S4Affected
  • 15.2(4)S6Affected
  • 15.2(4)S2Affected
  • 15.2(4)S5Affected
  • 15.2(4)S3Affected
  • 15.2(4)S3aAffected
  • 15.2(4)S4aAffected
  • 15.2(4)S7Affected
  • 15.3(1)TAffected
  • 15.3(2)TAffected
  • 15.3(1)T1Affected
  • 15.3(1)T2Affected
  • 15.3(1)T3Affected
  • 15.3(1)T4Affected
  • 15.3(2)T1Affected
  • and 528 more versions
Cisco Secure Firewall Adaptive Security Appliance (ASA) SoftwareCisco
  • 9.8.1Affected
  • 9.8.1.5Affected
  • 9.8.1.7Affected
  • 9.8.2Affected
  • 9.8.2.8Affected
  • 9.8.2.14Affected
  • 9.8.2.15Affected
  • 9.8.2.17Affected
  • 9.8.2.20Affected
  • 9.8.2.24Affected
  • 9.8.2.26Affected
  • 9.8.2.28Affected
  • 9.8.2.33Affected
  • 9.8.2.35Affected
  • 9.8.2.38Affected
  • 9.8.3.8Affected
  • 9.8.3.11Affected
  • 9.8.3.14Affected
  • 9.8.3.16Affected
  • 9.8.3.18Affected
  • 9.8.3.21Affected
  • 9.8.3Affected
  • 9.8.3.26Affected
  • 9.8.3.29Affected
  • 9.8.4Affected
  • and 210 more versions
Cisco IOS XE SoftwareCisco
  • 3.5.0EAffected
  • 3.5.1EAffected
  • 3.5.2EAffected
  • 3.5.3EAffected
  • 3.11.1SAffected
  • 3.11.2SAffected
  • 3.11.0SAffected
  • 3.11.3SAffected
  • 3.11.4SAffected
  • 3.12.0SAffected
  • 3.12.1SAffected
  • 3.12.2SAffected
  • 3.12.3SAffected
  • 3.12.0aSAffected
  • 3.12.4SAffected
  • 3.13.0SAffected
  • 3.13.1SAffected
  • 3.13.2SAffected
  • 3.13.3SAffected
  • 3.13.4SAffected
  • 3.13.5SAffected
  • 3.13.2aSAffected
  • 3.13.0aSAffected
  • 3.13.5aSAffected
  • 3.13.6SAffected
  • and 353 more versions
Cisco Secure Firewall Threat Defense (FTD) SoftwareCisco
  • 6.2.3Affected
  • 6.2.3.1Affected
  • 6.2.3.2Affected
  • 6.2.3.3Affected
  • 6.2.3.4Affected
  • 6.2.3.5Affected
  • 6.2.3.6Affected
  • 6.2.3.7Affected
  • 6.2.3.8Affected
  • 6.2.3.10Affected
  • 6.2.3.11Affected
  • 6.2.3.9Affected
  • 6.2.3.12Affected
  • 6.2.3.13Affected
  • 6.2.3.14Affected
  • 6.2.3.15Affected
  • 6.2.3.16Affected
  • 6.2.3.17Affected
  • 6.2.3.18Affected
  • 6.6.0Affected
  • 6.6.0.1Affected
  • 6.6.1Affected
  • 6.6.3Affected
  • 6.6.4Affected
  • 6.6.5Affected
  • and 80 more versions

References

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