CVE-2024-20436 Null dereference in Cisco IOS XE Software
Unauthenticated remote attackers can cause a denial of service on Cisco IOS XE devices by sending crafted HTTP traffic when Telephony Service is enabled.
- 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-2024-20436?
CVE-2024-20436 is a high-severity 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 HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a null pointer dereference when accessing specific URLs. An attacker could exploit this vulnerability by sending crafted HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, causing a DoS condition on the affected device.
Weakness: CWE-476
Which versions are affected by CVE-2024-20436?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2024-20436?
No fix has been published for CVE-2024-20436 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-20436 being exploited?
There is no known exploitation of CVE-2024-20436 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-mm34-xr6q-46qf.