CVE-2019-12659 Cisco IOS XE Software HTTP Server Denial of Service Vulnerability
An unauthenticated remote attacker can crash the HTTP server on Cisco IOS XE devices by generating high volumes of long-lived connections.
- 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-2019-12659?
CVE-2019-12659 is a medium-severity denial of service vulnerability in Cisco Ios Xe, published on 25 Sep 2019. 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 code of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the HTTP server to crash. The vulnerability is due to a logical error in the logging mechanism. An attacker could exploit this vulnerability by generating a high amount of long-lived connections to the HTTP service on the device. A successful exploit could allow the attacker to cause the HTTP server to crash.
Which versions are affected by CVE-2019-12659?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2019-12659?
No fix has been published for CVE-2019-12659 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-2019-12659 being exploited?
There is no known exploitation of CVE-2019-12659 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-mm2h-7gr4-522f.