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Vulnerability record · CVE-2020-4067 · published 29 June 2020

CVE-2020-4067: Coturn project coturn vulnerability

Coturn Project · Coturn

In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.

7.5 CVSS 3.1 High EPSS 1.9% · top 21.2% CWE-665 · CWE-665
7.5CVSS 3.1 base score, v2 5.0
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00010.html Mailing ListThird Party Advisory
https://github.com/coturn/coturn/blob/aab60340b201d55c007bcdc853230f47aa2dfdf1/ChangeLog#L15 Release Notes
https://github.com/coturn/coturn/issues/583 Issue TrackingThird Party Advisory
https://github.com/coturn/coturn/security/advisories/GHSA-c8r8-8vp5-6gcm Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00002.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5G35UBNSRLL6SYRTODYTMBJ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNJJO77ZLGGFJWNUGP6VDG5
https://usn.ubuntu.com/4415-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4711 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00010.html Mailing ListThird Party Advisory
https://github.com/coturn/coturn/blob/aab60340b201d55c007bcdc853230f47aa2dfdf1/ChangeLog#L15 Release Notes
https://github.com/coturn/coturn/issues/583 Issue TrackingThird Party Advisory
https://github.com/coturn/coturn/security/advisories/GHSA-c8r8-8vp5-6gcm Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00002.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5G35UBNSRLL6SYRTODYTMBJ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNJJO77ZLGGFJWNUGP6VDG5
https://usn.ubuntu.com/4415-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4711 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-4067), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.