CVE-2020-27507 Memory corruption in n/a

Critical 9.8 Published 15 Mar 2023 Updated 27 Feb 2025

A buffer overflow in Kamailio SIP server allows remote attackers to crash the service or potentially execute arbitrary code via crafted INVITE requests.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-27507?

CVE-2020-27507 is a critical memory corruption vulnerability in n/a, published on 15 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

Weakness: CWE-120

Which versions are affected by CVE-2020-27507?

It affects 1 product.

Products include Kamailio Kamailio.

How do I fix CVE-2020-27507?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-27507 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-27507 exists.

Sources

Also known as DEBIAN-CVE-2020-27507, DLA-3438-1, GHSA-q52j-c5xj-88qf, UBUNTU-CVE-2020-27507.