CVE-2017-12259 Denial of service in Cisco Small Business SPA51x Series IP Phones

What is CVE-2017-12259?

CVE-2017-12259 is a high-severity denial of service vulnerability in Cisco Small Business SPA51x Series IP Phones, published on 19 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 implementation of Session Initiation Protocol (SIP) functionality in Cisco Small Business SPA51x Series 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 the improper handling of SIP request messages by an affected device. An attacker could exploit this vulnerability by sending malformed 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. This vulnerability affects Cisco Small Business SPA51x Series IP Phones that are running Cisco SPA51x Firmware Release 7.6.2SR1 or earlier. Cisco Bug IDs: CSCvc63982.

Weakness: CWE-119

Which versions are affected by CVE-2017-12259?

It affects 1 product.

Products include Cisco Small Business Ip Phone Firmware.

How do I fix CVE-2017-12259?

No fix has been published for CVE-2017-12259 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-2017-12259 being exploited?

There is no known exploitation of CVE-2017-12259 in the wild and no public exploit code.

Sources

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

Also known as GHSA-g746-47q2-f2cr.