CVE-2024-20308

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-27 · updated 2026-06-17
Weakness: CWE-787

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 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..

Affected products

Cisco IOS: 12.4(22)md, 12.4(22)md1, 12.4(22)md2, 12.4(22)mda, 12.4(22)mda1, 12.4(22)mda2 (+625)
Cisco IOS XE: 3.3.0sg, 3.3.1sg, 3.3.2sg, 3.4.0sg, 3.4.1sg, 3.4.2sg (+375)

References

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