What is CVE-2018-14767?

CVE-2018-14767 is a critical-severity vulnerability in Kamailio, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-07-31.

How severe is CVE-2018-14767?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Kamailio

CVE-2018-14767

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-07-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.293 (98.1th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.293 · newest: 0.293 · change: 0.000

Affected products

Kamailio
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.debian.org/security/2018/dsa-4267 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2018/08/msg00018.html (mailing-list, Mailing List, Third Party Advisory)
skalatan.de/blog/advisory-hw-2018-05 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-14767?: CVE-2018-14767 is a critical-severity vulnerability in Kamailio, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-07-31.
How severe is CVE-2018-14767?: Critical severity. CVSS v3 base score is 9.8 out of 10.