CVE-2021-1352 Cisco IOS XE Software DECnet Phase IV/OSI Denial of Service Vulnerability

High 7.4 Published 24 Mar 2021 Updated 8 Nov 2024

An unauthenticated adjacent attacker can cause a denial of service on Cisco IOS XE devices by sending malformed DECnet traffic.

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

What is CVE-2021-1352?

CVE-2021-1352 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 24 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the DECnet Phase IV and DECnet/OSI protocol processing of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation of DECnet traffic that is received by an affected device. An attacker could exploit this vulnerability by sending DECnet traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Weakness: CWE-119, CWE-823

Which versions are affected by CVE-2021-1352?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2021-1352?

No fix has been published for CVE-2021-1352 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-2021-1352 being exploited?

There is no known exploitation of CVE-2021-1352 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-vcq5-wh47-842g.