What is the severity of CVE-2024-20307?

CVE-2024-20307 is rated as a critical severity vulnerability due to its potential to allow remote attackers to cause a heap overflow.

How do I fix CVE-2024-20307?

To fix CVE-2024-20307, upgrade to the recommended patched versions of Cisco IOS Software or Cisco IOS XE Software as specified in the security advisory.

Who is affected by CVE-2024-20307?

Devices running unpatched versions of Cisco IOS Software and Cisco IOS XE Software are vulnerable to CVE-2024-20307.

What types of attacks can exploit CVE-2024-20307?

CVE-2024-20307 can be exploited by unauthenticated remote attackers sending crafted fragmented IKEv1 packets.

What could happen if CVE-2024-20307 is exploited?

If successfully exploited, CVE-2024-20307 could lead to a heap overflow that results in an affected device reloading.

Vulnerability/
CVE-2024-20307

medium

6.8

CWE

121

27/3/2024

1/8/2024

CVE-2024-20307

First published: Wed Mar 27 2024(Updated: )

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.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS
Cisco IOS XE Software

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Reference Links

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

Frequently Asked Questions

What is the severity of CVE-2024-20307?
CVE-2024-20307 is rated as a critical severity vulnerability due to its potential to allow remote attackers to cause a heap overflow.
How do I fix CVE-2024-20307?
To fix CVE-2024-20307, upgrade to the recommended patched versions of Cisco IOS Software or Cisco IOS XE Software as specified in the security advisory.
Who is affected by CVE-2024-20307?
Devices running unpatched versions of Cisco IOS Software and Cisco IOS XE Software are vulnerable to CVE-2024-20307.
What types of attacks can exploit CVE-2024-20307?
CVE-2024-20307 can be exploited by unauthenticated remote attackers sending crafted fragmented IKEv1 packets.
What could happen if CVE-2024-20307 is exploited?
If successfully exploited, CVE-2024-20307 could lead to a heap overflow that results in an affected device reloading.

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