CVE-2025-20239
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco IOS Software, IOS XE Software, Secure Firewall Adaptive…
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco IOS Software, IOS XE Software, Secure Firewall Adaptive Security Appliance (ASA) Software, and 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. This vulnerability is due to a lack of proper processing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. In the case of Cisco IOS and IOS XE Software, a successful exploit could allow the attacker to cause the device to reload unexpectedly. In the case of Cisco ASA and FTD Software, a successful exploit could allow the attacker to partially exhaust system memory, causing system instability such as being unable to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Deferred | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.64% · top 49% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.
Weakness
Affected products
- affected 15.2(4)E
- affected 15.2(4)E1
- affected 15.2(4)E2
- affected 15.2(5)E
- affected 15.2(4)E3
- affected 15.2(5)E1
- affected 15.2(5b)E
- affected 15.2(5a)E1
- affected 15.2(4)E4
- affected 15.2(5)E2
- affected 15.2(6)E
- affected 15.2(4)E5
- affected 15.2(5)E2c
- affected 15.2(6)E0a
- affected 15.2(6)E1
- affected 15.2(6)E0c
- affected 15.2(4)E6
- affected 15.2(6)E2
- affected 15.2(4)E7
- affected 15.2(7)E
- affected 15.2(4)E8
- affected 15.2(6)E2a
- affected 15.2(7)E1
- affected 15.2(7)E0a
- affected 15.2(7)E0b
- affected 15.2(7)E0s
- affected 15.2(6)E3
- affected 15.2(4)E9
- affected 15.2(7)E2
- affected 15.2(7a)E0b
- affected 15.2(4)E10
- affected 15.2(7)E3
- affected 15.2(7)E1a
- affected 15.2(7b)E0b
- affected 15.2(4)E10a
- affected 15.2(7)E4
- affected 15.2(8)E
- affected 15.2(8)E1
- affected 15.2(7)E5
- affected 15.2(7)E6
- and 198 more
Cisco · Cisco Adaptive Security Appliance (ASA) Software
- affected 9.8.1
- affected 9.8.1.5
- affected 9.8.1.7
- affected 9.8.2
- affected 9.8.2.8
- affected 9.8.2.14
- affected 9.8.2.15
- affected 9.8.2.17
- affected 9.8.2.20
- affected 9.8.2.24
- affected 9.8.2.26
- affected 9.8.2.28
- affected 9.8.2.33
- affected 9.8.2.35
- affected 9.8.2.38
- affected 9.8.3.8
- affected 9.8.3.11
- affected 9.8.3.14
- affected 9.8.3.16
- affected 9.8.3.18
- affected 9.8.3.21
- affected 9.8.3
- affected 9.8.3.26
- affected 9.8.3.29
- affected 9.8.4
- affected 9.8.4.3
- affected 9.8.4.7
- affected 9.8.4.8
- affected 9.8.4.10
- affected 9.8.4.12
- affected 9.8.4.15
- affected 9.8.4.17
- affected 9.8.2.45
- affected 9.8.4.25
- affected 9.8.4.20
- affected 9.8.4.22
- affected 9.8.4.26
- affected 9.8.4.29
- affected 9.8.4.32
- affected 9.8.4.33
- and 180 more
- affected 3.14.0S
- affected 3.14.1S
- affected 3.14.2S
- affected 3.14.3S
- affected 3.14.4S
- affected 3.15.0S
- affected 3.15.1S
- affected 3.15.2S
- affected 3.15.1cS
- affected 3.15.3S
- affected 3.15.4S
- affected 3.16.0S
- affected 3.16.1S
- affected 3.16.1aS
- affected 3.16.2S
- affected 3.16.2aS
- affected 3.16.0cS
- affected 3.16.3S
- affected 3.16.2bS
- affected 3.16.3aS
- affected 3.16.4S
- affected 3.16.4aS
- affected 3.16.4bS
- affected 3.16.5S
- affected 3.16.4dS
- affected 3.16.6S
- affected 3.16.7S
- affected 3.16.6bS
- affected 3.16.7aS
- affected 3.16.7bS
- affected 3.16.8S
- affected 3.16.9S
- affected 3.16.10S
- affected 3.17.0S
- affected 3.17.1S
- affected 3.17.2S
- affected 3.17.1aS
- affected 3.17.3S
- affected 3.17.4S
- affected 16.1.1
- and 294 more
Cisco · Cisco Firepower Threat Defense Software
- affected 6.2.3
- affected 6.2.3.1
- affected 6.2.3.2
- affected 6.2.3.3
- affected 6.2.3.4
- affected 6.2.3.5
- affected 6.2.3.6
- affected 6.2.3.7
- affected 6.2.3.8
- affected 6.2.3.10
- affected 6.2.3.11
- affected 6.2.3.9
- affected 6.2.3.12
- affected 6.2.3.13
- affected 6.2.3.14
- affected 6.2.3.15
- affected 6.2.3.16
- affected 6.2.3.17
- affected 6.2.3.18
- affected 6.6.0
- affected 6.6.0.1
- affected 6.6.1
- affected 6.6.3
- affected 6.6.4
- affected 6.6.5
- affected 6.6.5.1
- affected 6.6.5.2
- affected 6.6.7
- affected 6.6.7.1
- affected 6.6.7.2
- affected 6.4.0
- affected 6.4.0.1
- affected 6.4.0.3
- affected 6.4.0.2
- affected 6.4.0.4
- affected 6.4.0.5
- affected 6.4.0.6
- affected 6.4.0.7
- affected 6.4.0.8
- affected 6.4.0.9
- and 54 more
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
References (1)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-20239)Record last updated .