What’s Vulnerable › Vulnerabilities

CVE-2018-8828

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 30.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-20 · updated 2026-06-17
• Weakness: CWE-193

Description

A Buffer Overflow issue was discovered in Kamailio before 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2. A specially crafted REGISTER message with a malformed branch or From tag triggers an off-by-one heap-based buffer overflow in the tmx_check_pretran function in modules/tmx/tmx_pretran.c.

Affected products

• Debian Linux: 8.0, 9.0
• Kamailio: before 4.4.7; from 5.0.0 before 5.0.6; from 5.1.0 before 5.1.2 — fixed in 4.4.7, 5.0.6, 5.1.2

How to fix

Upgrade to a fixed version: Kamailio 4.4.7, 5.0.6, 5.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/EnableSecurity/advisories/tree/master/ES2018-05-kamailio-heap-overflow
• https://github.com/kamailio/kamailio/commit/e1d8008a09d9390ebaf698abe8909e10dfec4097
• https://usn.ubuntu.com/4240-1/
• https://www.debian.org/security/2018/dsa-4148
• https://github.com/EnableSecurity/advisories/tree/master/ES2018-05-kamailio-heap-overflow
• https://github.com/kamailio/kamailio/commit/e1d8008a09d9390ebaf698abe8909e10dfec4097
• https://usn.ubuntu.com/4240-1/
• https://www.debian.org/security/2018/dsa-4148

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