CVE-2021-1378 Cisco StarOS Denial of Service Vulnerability

Medium 5.3 Published 17 Feb 2021 Updated 8 Nov 2024

Unauthenticated remote attackers can cause a denial of service on Cisco StarOS devices by sending crafted packets to the SSH service.

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-2021-1378?

CVE-2021-1378 is a medium-severity denial of service vulnerability in Cisco ASR 5000 Series Software, published on 17 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the SSH service of the Cisco StarOS operating system could allow an unauthenticated, remote attacker to cause an affected device to stop processing traffic, resulting in a denial of service (DoS) condition. The vulnerability is due to a logic error that may occur under specific traffic conditions. An attacker could exploit this vulnerability by sending a series of crafted packets to an affected device. A successful exploit could allow the attacker to prevent the targeted service from receiving any traffic, which would lead to a DoS condition on the affected device.

Weakness: CWE-400

Which versions are affected by CVE-2021-1378?

It affects 1 product.

Products include Cisco Staros.

How do I fix CVE-2021-1378?

No fix has been published for CVE-2021-1378 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-2021-1378 being exploited?

There is no known exploitation of CVE-2021-1378 in the wild and no public exploit code.

Sources

Also known as GHSA-qj86-q34h-pf43.