CVE-2020-4067

Name: CVE-2020-4067
Creator: NVD / NIST
Published: 2020-06-29T20:15:10.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.85%

Last modified Jun 17, 2026

CVE-2020-4067 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.85%

76.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Coturn Project	Coturn	< 4.5.1.3
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Canonical	Ubuntu Linux	20.04
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00010.htmlMailing List, Third Party Advisory
https://github.com/coturn/coturn/blob/aab60340b201d55c007bcdc853230f47aa2dfdf1/ChangeLog#L15Release Notes
https://github.com/coturn/coturn/issues/583Issue Tracking, Third Party Advisory
https://github.com/coturn/coturn/security/advisories/GHSA-c8r8-8vp5-6gcmThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00002.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5G35UBNSRLL6SYRTODYTMBJ65TLQILUM/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNJJO77ZLGGFJWNUGP6VDG5HPAC5UDBK/
https://usn.ubuntu.com/4415-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4711Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00010.htmlMailing List, Third Party Advisory
https://github.com/coturn/coturn/blob/aab60340b201d55c007bcdc853230f47aa2dfdf1/ChangeLog#L15Release Notes
https://github.com/coturn/coturn/issues/583Issue Tracking, Third Party Advisory
https://github.com/coturn/coturn/security/advisories/GHSA-c8r8-8vp5-6gcmThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00002.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5G35UBNSRLL6SYRTODYTMBJ65TLQILUM/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNJJO77ZLGGFJWNUGP6VDG5HPAC5UDBK/
https://usn.ubuntu.com/4415-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4711Third Party Advisory

Timeline

Published: Jun 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-4067?

How severe is CVE-2020-4067?

CVE-2020-4067 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.

How do I fix CVE-2020-4067?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-4067?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST