CVE-2024-20307A vulnerability in the IKEv1 fragmentation code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote…
- 6.8MediumCVSS base score
- 0.73%Exploitation in 30 daysEPSS · top 45% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the IKEv1 fragmentation code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a heap overflow, resulting in an affected device reloading. This vulnerability exists because crafted, fragmented IKEv1 packets are not properly reassembled. An attacker could exploit this vulnerability by sending crafted UDP packets to an affected system. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Only traffic that is directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered by IPv4 and IPv6 traffic.
Timeline
ID reserved
By cisco
- 5 months later
· 5 months later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.73% · top 45% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Affected products
- affected 15.1(2)SG8
- affected 15.2(4)M11
- affected 15.1(2)SY8
- affected 15.1(2)SY9
- affected 15.1(2)SY10
- affected 15.1(2)SY11
- affected 15.1(2)SY12
- affected 15.1(2)SY13
- affected 15.1(2)SY14
- affected 15.1(2)SY15
- affected 15.1(2)SY16
- affected 15.3(3)S8
- affected 15.3(3)S9
- affected 15.3(3)S10
- affected 15.3(3)S8a
- affected 15.2(4)E2
- affected 15.2(3)E4
- affected 15.2(5)E
- affected 15.2(4)E3
- affected 15.2(5b)E
- affected 15.2(3)E5
- affected 15.2(4)E4
- affected 15.2(4)E5
- affected 15.2(4)E5a
- affected 15.2(4)E6
- affected 15.2(4)E7
- affected 15.2(4)E8
- affected 15.2(4)E9
- affected 15.2(4)E10
- affected 15.2(4)E10a
- affected 15.2(4)E10d
- affected 15.4(3)S6
- affected 15.4(3)S7
- affected 15.4(3)S6a
- affected 15.4(3)S8
- affected 15.4(3)S9
- affected 15.4(3)S10
- affected 15.3(3)M8
- affected 15.3(3)M9
- affected 15.3(3)M10
- and 107 more
- affected 3.4.8SG
- affected 3.10.8S
- affected 3.10.8aS
- affected 3.10.9S
- affected 3.10.10S
- affected 3.13.6S
- affected 3.13.7S
- affected 3.13.6aS
- affected 3.13.7aS
- affected 3.13.8S
- affected 3.13.9S
- affected 3.13.10S
- affected 3.14.4S
- affected 3.15.4S
- affected 3.7.4E
- affected 3.7.5E
- affected 3.16.3S
- 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 16.1.3
- affected 16.2.1
- affected 16.2.2
- affected 3.8.2E
- affected 3.8.3E
- affected 3.8.4E
- affected 3.8.5E
- affected 3.8.5aE
- affected 3.8.6E
- and 178 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 vulnerability that is described in this advisory.
References
References1
- cisco-sa-ikev1-NO2ccFWz (opens in a new tab)x_transferred
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)
- EUVD EUVD-2024-18022 (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://cveledger.app/cve/CVE-2024-20307)Record last updated .