CVE-2024-20307

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2024-03-27 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 07:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.7% in the next 30 days (EPSS).
• Severity: 6.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2024-03-27 18:15 UTC

Last modified

2026-06-17 07:06 UTC

Exploit probability

0.7% · EPSS, next 30 days

Weakness

CWE-121

Record status

Analyzed

Affected

• Cisco iOS 15.1\(2\)sg8
• Cisco iOS 15.1\(2\)sy8
• Cisco iOS 15.1\(2\)sy9
• Cisco iOS 15.1\(2\)sy10
• Cisco iOS 15.1\(2\)sy11
• Cisco iOS 15.1\(2\)sy12
• Cisco iOS 15.1\(2\)sy13
• Cisco iOS 15.1\(2\)sy14

Attack profile CVSS 3.1 · 6.8

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2024-20307.md and follow it. Check whether this project is affected by CVE-2024-20307. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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