CVE-2020-11501

Name: CVE-2020-11501
Creator: NVD / NIST
Published: 2020-04-03T13:15:13.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 3.39%

Last modified Jun 17, 2026

CVE-2020-11501 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. EPSS estimates a 3.39% chance of exploitation in the next 30 days.

Description

GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

3.39%

87.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-330

Affected Software

Vendor	Product	Versions
Gnu	Gnutls	>= 3.6.3, < 3.6.13
Canonical	Ubuntu Linux	19.10
Debian	Debian Linux	10.0
Opensuse	Leap	15.1
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32

References

http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.htmlThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2Patch, Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/960Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/
https://security.gentoo.org/glsa/202004-06Third Party Advisory
https://security.netapp.com/advisory/ntap-20200416-0002/Third Party Advisory
https://usn.ubuntu.com/4322-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4652Third Party Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.htmlThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2Patch, Third Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/960Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/
https://security.gentoo.org/glsa/202004-06Third Party Advisory
https://security.netapp.com/advisory/ntap-20200416-0002/Third Party Advisory
https://usn.ubuntu.com/4322-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4652Third Party Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31Vendor Advisory

Timeline

Published: Apr 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-11501?

How severe is CVE-2020-11501?

CVE-2020-11501 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 3.39% probability of exploitation in the next 30 days.

How do I fix CVE-2020-11501?

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-2020-11501?

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

Scan your code now

Source: NVD / NIST