CVE-2018-14767

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 29.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-07-31 · updated 2026-06-17
Weakness: CWE-20

Description

In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with a double "To" header and an empty "To" tag causes a segmentation fault and crash. The reason is missing input validation in the "build_res_buf_from_sip_req" core function. This could result in denial of service and potentially the execution of arbitrary code.

Affected products

Debian Linux: 8.0, 9.0
Kamailio: before 5.0.7; from 5.1.0 before 5.1.4 — fixed in 5.0.7, 5.1.4

How to fix

Upgrade to a fixed version: Kamailio 5.0.7, 5.1.4. Check the vendor advisory for mitigations.

References

https://lists.debian.org/debian-lts-announce/2018/08/msg00018.html
https://skalatan.de/blog/advisory-hw-2018-05
https://www.debian.org/security/2018/dsa-4267
https://lists.debian.org/debian-lts-announce/2018/08/msg00018.html
https://skalatan.de/blog/advisory-hw-2018-05
https://www.debian.org/security/2018/dsa-4267

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