CVE-2018-16657

Name: CVE-2018-16657
Creator: NVD / NIST
Published: 2018-09-07T14:29:03.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.58%

Last modified Jun 17, 2026

CVE-2018-16657 is a vulnerability of currently unknown severity. 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. EPSS estimates a 3.58% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

3.58%

87.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Kamailio	Kamailio	< 5.0.7
Kamailio	Kamailio	>= 5.1.0, < 5.1.4

References

https://lists.debian.org/debian-lts-announce/2018/09/msg00013.htmlMailing List, Third Party Advisory
https://skalatan.de/blog/advisory-hw-2018-06Exploit, Patch, Third Party Advisory
https://www.debian.org/security/2018/dsa-4292Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00013.htmlMailing List, Third Party Advisory
https://skalatan.de/blog/advisory-hw-2018-06Exploit, Patch, Third Party Advisory
https://www.debian.org/security/2018/dsa-4292Third Party Advisory

Timeline

Published: Sep 7, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-16657?

How severe is CVE-2018-16657?

Severity scoring for CVE-2018-16657 is pending analysis. The EPSS model estimates a 3.58% probability of exploitation in the next 30 days.

How do I fix CVE-2018-16657?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-16657?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST