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Vulnerability record · CVE-2018-16657 · published 7 September 2018

CVE-2018-16657: Debian linux null pointer dereference vulnerability

Debian · Debian Linux

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.

9.8 CVSS 3.0 Critical EPSS 3.6% · top 11.0% CWE-476 · NULL pointer dereference
9.8CVSS 3.0 base score, v2 7.5
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.debian.org/debian-lts-announce/2018/09/msg00013.html Mailing ListThird Party Advisory
https://skalatan.de/blog/advisory-hw-2018-06 ExploitPatchThird Party Advisory
https://www.debian.org/security/2018/dsa-4292 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00013.html Mailing ListThird Party Advisory
https://skalatan.de/blog/advisory-hw-2018-06 ExploitPatchThird Party Advisory
https://www.debian.org/security/2018/dsa-4292 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-16657), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.