Buffer Underwrite ('Buffer Underflow') in Cisco IOS and Cisco IOS XE - CVE-2024-20308

Vulnerability identifier: #VU87897

CSH Severity: High

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2024-20308

CWE-ID: CWE-124

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a crafted, fragmented IKEv1 packets are not properly reassembled. A remote attacker can send specially crafted UDP packets and cause a denial of service condition on the target system.

Cisco IOS
Cisco IOS XE

Install updates from vendor's website.

Cisco IOS - addressed in versions 16.12.10, 16.12.10a, 17.3.8, 17.3.8a, 17.6.6, 17.6.6a, 17.9.1y1, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, 17.12.1, 17.12.1w, 17.12.1x, 17.12.1a, 17.12.2, 17.12.2a, 17.12.3, 17.13.1, 17.13.1a
Cisco IOS XE - addressed in versions Amsterdam-17.3.8, Bengaluru-17.6.6, Dublin-17.12.1, Dublin-17.12.2, Cupertino-17.9.4, Cupertino-17.9.5, 16.12.10, 16.12.10a, 17.3.8, 17.3.8a, 17.6.6, 17.6.6a, 17.9.1y1, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, 17.12.1, 17.12.1w, 17.12.1x, 17.12.1a, 17.12.2, 17.12.2a, 17.12.02a, 17.12.3, 17.13.1, 17.13.1a

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ikev1-NO2ccFWz

• Multiple vulnerabilities in Cisco IOS and IOS XE Software