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Public proof of conceptFix available

CVE-2020-27507

A public proof of concept exists; no exploitation attested.

  • Published2023-03-15
  • Fixed in5.5.0
  • WeaknessCWE-120

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-03-1520:15CVE publishedNVD

Versions per branch

NVD
Kamailio
BranchAffectedFixed in
5.5< 5.5.05.5.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kamailioUbuntu:Pro:20.04:LTSall versions · fixed in 5.3.2-1ubuntu0.1~esm1
  • kamailioUbuntu:Pro:18.04:LTSall versions · fixed in 5.1.2-1ubuntu2+esm1
  • kamailioUbuntu:Pro:16.04:LTSall versions · fixed in 4.3.4-1.1ubuntu2.1+esm1
  • kamailioDebian:14all versions · fixed in 5.4.2-1
  • kamailioDebian:13all versions · fixed in 5.4.2-1
  • kamailioDebian:12all versions · fixed in 5.4.2-1
  • kamailioDebian:10all versions · fixed in 5.2.1-1+deb10u1

Full record on NVD

Fix

  1. Update Kamailio to 5.5.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-03-15
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-q52j-c5xj-88qf

Frequently asked questions

What is CVE-2020-27507?

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.

Is CVE-2020-27507 actively exploited?

A proof-of-concept exploit exists for CVE-2020-27507, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2020-27507?

CVE-2020-27507 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record