CVE-2024-20376 Denial of service in Cisco IP Phones with Multiplatform Firmware

High 7.5 Published 1 May 2024 Updated 1 Aug 2024

Unauthenticated remote attackers can cause Cisco IP Phones to reload via crafted web requests, resulting in a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-20376?

CVE-2024-20376 is a high-severity denial of service vulnerability in Cisco IP Phones with Multiplatform Firmware, published on 1 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the web-based management interface of Cisco IP Phone firmware could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a DoS condition. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

Weakness: CWE-787

Which versions are affected by CVE-2024-20376?

It affects 18 products.

Products include Cisco Ip Phone 6821 With Multiplatform Firmware, Cisco Ip Phone 6841 With Multiplatform Firmware, Cisco Ip Phone 6851 With Multiplatform Firmware, Cisco Ip Phone 6861 With Multiplatform Firmware, Cisco Ip Phone 6871 With Multiplatform Firmware, Cisco Ip Phone 7811 With Multiplatform Firmware and 12 more.

How do I fix CVE-2024-20376?

No fix has been published for CVE-2024-20376 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-20376 being exploited?

There is no known exploitation of CVE-2024-20376 in the wild and no public exploit code.

Sources

Also known as GHSA-fvx9-q8pv-wxv9.