HOMEVULNERABILITIESCVE-2020-27507
CRITICAL

CVE-2020-27507

CWE-120Published: March 15, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

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.

NVD Source

Technical Analysis

CVE-2020-27507 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

kamailio1 product(s)
kamailio
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f
PATCHhttps://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f

All References (6)

→
https://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685fPatch
→
https://github.com/kamailio/kamailio/issues/2503Exploit · Issue Tracking
→
https://lists.debian.org/debian-lts-announce/2023/05/msg00030.html
→
https://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685fPatch
→
https://github.com/kamailio/kamailio/issues/2503Exploit · Issue Tracking
→
https://lists.debian.org/debian-lts-announce/2023/05/msg00030.html

Quick Facts

CVE IDCVE-2020-27507
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-120
CISA KEVNo
Affected1 vendor(s)
PublishedMar 15, 2023

Related CVEs (CWE-120)

CVE-2017-16740
10.0
CVE-2021-33972
10.0
CVE-2010-10016
10.0
CVE-2008-3496
10.0
CVE-2022-20827
10.0
CVE-2021-33975
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27507 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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