CVE-2025-20149 Memory corruption in Cisco IOS XE Software

Medium 6.5 Published 24 Sep 2025 Updated 24 Sep 2025

A local authenticated attacker can trigger a buffer overflow via CLI commands, causing a denial of service on Cisco IOS devices.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-20149?

CVE-2025-20149 is a medium-severity memory corruption vulnerability in Cisco Ios, published on 24 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the CLI of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a buffer overflow. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the CLI prompt. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Weakness: CWE-120

Which versions are affected by CVE-2025-20149?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2025-20149?

No fix has been published for CVE-2025-20149 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-20149 being exploited?

There is no known exploitation of CVE-2025-20149 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-833m-h6fc-hmvx.