CVE-2018-0389 Cisco Small Business SPA514G IP Phones SIP Denial of Service Vulnerability

What is CVE-2018-0389?

CVE-2018-0389 is a high-severity denial of service vulnerability in Cisco Small Business SPA500 Series IP Phones, published on 13 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the implementation of Session Initiation Protocol (SIP) processing in Cisco Small Business SPA514G IP Phones could allow an unauthenticated, remote attacker to cause an affected device to become unresponsive, resulting in a denial of service (DoS) condition. The vulnerability is due to improper processing of SIP request messages by an affected device. An attacker could exploit this vulnerability by sending crafted SIP messages to an affected device. A successful exploit could allow the attacker to cause the affected device to become unresponsive, resulting in a DoS condition that persists until the device is restarted manually. Cisco has not released software updates that address this vulnerability. This vulnerability affects Cisco Small Business SPA514G IP Phones that are running firmware release 7.6.2SR2 or earlier.

Weakness: CWE-399

Which versions are affected by CVE-2018-0389?

It affects 1 product.

Products include Cisco Spa514g Firmware.

How do I fix CVE-2018-0389?

No fix has been published for CVE-2018-0389 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-2018-0389 being exploited?

There is no known exploitation of CVE-2018-0389 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-wv94-3p8w-fgm3.