CVE-2017-12270 Denial of service in Cisco IOS XR

High 7.5 Published 5 Oct 2017 Updated 5 Aug 2024

Unauthenticated remote attackers can cause a denial of service on Cisco NCS 5500 routers by sending malformed HTTP/2 frames to the gRPC 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-2017-12270?

CVE-2017-12270 is a high-severity denial of service vulnerability in Cisco Ios Xr, published on 5 Oct 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the gRPC code of Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the emsd service stops. The vulnerability is due to the software's inability to process HTTP/2 packets. An attacker could exploit this vulnerability by sending a malformed HTTP/2 frame to the affected device. A successful exploit could allow the attacker to create a DoS condition when the emsd service stops. Cisco Bug IDs: CSCvb99388.

Weakness: CWE-119

Which versions are affected by CVE-2017-12270?

It affects 1 product.

Products include Cisco Ios Xr.

How do I fix CVE-2017-12270?

No fix has been published for CVE-2017-12270 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-2017-12270 being exploited?

There is no known exploitation of CVE-2017-12270 in the wild and no public exploit code.

All Cisco Ios Xr vulnerabilities

Sources

Also known as GHSA-gwgv-g6qj-rm37.