According to its self-reported version, Cisco IOS is affected by multiple vulnerabilities.

  - 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. (CVE-2024-20307)

  - 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 underflow, 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 denial of service (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..
    (CVE-2024-20308)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Detections

Analytics

Cisco IOS Software Internet Key Exchange Version 1 Fragmentation DoS (cisco-sa-ikev1-NO2ccFWz)

high Nessus Plugin ID 198146

Version 1.2

Version 1.1

Version 1.2 Jul 1, 2025, 9:53 AM CVSS metrics ("CVSSv3 score" set to 7.5) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H") Plugin Feed: 202507010953
Version 1.1 May 30, 2024, 8:07 PM New Plugin Feed: 202405302007