CVE-2018-0132 Denial of service in Cisco IOS XR

High 8.6 Published 8 Feb 2018 Updated 2 Dec 2024

Remote unauthenticated attackers can cause a denial of service in Cisco IOS XR by sending large routing updates that corrupt the forwarding information base.

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-2018-0132?

CVE-2018-0132 is a high-severity denial of service vulnerability in Cisco IOS XR, published on 8 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the forwarding information base (FIB) code of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause inconsistency between the routing information base (RIB) and the FIB, resulting in a denial of service (DoS) condition. The vulnerability is due to incorrect processing of extremely long routing updates. An attacker could exploit this vulnerability by sending a large routing update. A successful exploit could allow the attacker to trigger inconsistency between the FIB and the RIB, resulting in a DoS condition. Cisco Bug IDs: CSCus84718.

Weakness: CWE-119

Which versions are affected by CVE-2018-0132?

It affects 1 product.

Products include Cisco Carrier Routing System.

How do I fix CVE-2018-0132?

No fix has been published for CVE-2018-0132 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-2018-0132 being exploited?

There is no known exploitation of CVE-2018-0132 in the wild and no public exploit code.

Sources

Also known as GHSA-c9gw-ww29-cmh7.