CVE-2018-16657 Null dereference in n/a

What is CVE-2018-16657?

CVE-2018-16657 is a critical vulnerability in Debian Debian Linux, published on 7 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio. The reason is missing input validation in the crcitt_string_array core function for calculating a CRC hash for To tags. (An additional error is present in the check_via_address core function: this function also misses input validation.) This could result in denial of service and potentially the execution of arbitrary code.

Weakness: CWE-476

Which versions are affected by CVE-2018-16657?

It affects 2 products.

Products include Debian Debian Linux, Kamailio Kamailio.

How do I fix CVE-2018-16657?

Upgrade to a fixed version.

Is CVE-2018-16657 being exploited?

There is no known exploitation of CVE-2018-16657 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2018-16657, DLA-1503-1, DSA-4292-1, GHSA-4477-4jr7-cfjq, UBUNTU-CVE-2018-16657.