CVE-2024-20455 Denial of service in Cisco IOS XE Catalyst SD-WAN
An unauthenticated remote attacker can cause a denial of service on Cisco IOS XE devices by sending crafted traffic through an SD-WAN IPsec tunnel.
- 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-2024-20455?
CVE-2024-20455 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 25 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the process that classifies traffic that is going to the Unified Threat Defense (UTD) component of Cisco IOS XE Software in controller mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because UTD improperly handles certain packets as those packets egress an SD-WAN IPsec tunnel. An attacker could exploit this vulnerability by sending crafted traffic through an SD-WAN IPsec tunnel that is configured on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: SD-WAN tunnels that are configured with Generic Routing Encapsulation (GRE) are not affected by this vulnerability.
Weakness: CWE-371
Which versions are affected by CVE-2024-20455?
It affects 2 products.
Products include Cisco Ios Xe, Cisco Ios Xe Sd-Wan.
How do I fix CVE-2024-20455?
No fix has been published for CVE-2024-20455 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-2024-20455 being exploited?
There is no known exploitation of CVE-2024-20455 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xe
- CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation
- CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution
- CVE-2023-20273 Cisco IOS XE Web UI Command Injection
- CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software
- CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability
Sources
Also known as GHSA-j9wc-h525-rvc7.