CVE-2020-13962

Name: CVE-2020-13962
Creator: NVD / NIST
Published: 2020-06-09T00:15:10.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.01%

Last modified Jun 17, 2026

CVE-2020-13962 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. EPSS estimates a 3.01% chance of exploitation in the next 30 days.

Description

Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.01%

85.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mumble	Mumble	1.3.0
Qt	Qt	>= 5.12.2, < 5.12.9
Qt	Qt	>= 5.13.0, <= 5.13.2
Qt	Qt	>= 5.14.0, <= 5.14.2
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00004.htmlMailing List, Third Party Advisory
https://bugreports.qt.io/browse/QTBUG-83450Issue Tracking, Vendor Advisory
https://github.com/mumble-voip/mumble/issues/3679Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/mumble-voip/mumble/pull/4032Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X6EDPIIAQPVP2CHL2CHDHJ25EECA7UE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQJDBZUYMMF4R5QQKD2HTIKQU2NSKO63/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3IZY7LKJ6NAXQDFYFR4S7L5BBHYK53K/
https://security.gentoo.org/glsa/202007-18Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00004.htmlMailing List, Third Party Advisory
https://bugreports.qt.io/browse/QTBUG-83450Issue Tracking, Vendor Advisory
https://github.com/mumble-voip/mumble/issues/3679Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/mumble-voip/mumble/pull/4032Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X6EDPIIAQPVP2CHL2CHDHJ25EECA7UE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQJDBZUYMMF4R5QQKD2HTIKQU2NSKO63/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3IZY7LKJ6NAXQDFYFR4S7L5BBHYK53K/
https://security.gentoo.org/glsa/202007-18Third Party Advisory

Timeline

Published: Jun 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13962?

How severe is CVE-2020-13962?

CVE-2020-13962 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.01% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13962?

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-2020-13962?

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

Scan your code now

Source: NVD / NIST