CVE-2019-1887 Cisco Unified Communications Manager Session Initiation Protocol Denial of Service Vulnerability

High 8.6 Published 6 Jul 2019 Updated 19 Nov 2024

Unauthenticated remote attackers can cause a denial of service by sending malformed SIP packets, disrupting phone registrations in Cisco Unified Communications Manager.

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-2019-1887?

CVE-2019-1887 is a high-severity denial of service vulnerability in Cisco Unified Communications Manager, published on 6 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Session Initiation Protocol (SIP) protocol implementation of Cisco Unified Communications Manager could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of input SIP traffic. An attacker could exploit this vulnerability by sending a malformed SIP packet to an affected Cisco Unified Communications Manager. A successful exploit could allow the attacker to trigger a new registration process on all connected phones, temporarily disrupting service.

Weakness: CWE-787

Which versions are affected by CVE-2019-1887?

It affects 1 product.

Products include Cisco Unified Communications Manager.

How do I fix CVE-2019-1887?

No fix has been published for CVE-2019-1887 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-2019-1887 being exploited?

There is no known exploitation of CVE-2019-1887 in the wild and no public exploit code.

All Cisco Unified Communications Manager vulnerabilities

Sources

Also known as GHSA-v6rv-mppr-vw2j.