CVE-2020-11501

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.

Category

7.4
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 27.55% Top 5%
Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory gnutls.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://security.gentoo.org/glsa/202004-06 third party advisory vendor advisory
https://gitlab.com/gnutls/gnutls/-/issues/960 issue tracking third party advisory patch
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2 third party advisory patch
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31 vendor advisory
https://www.debian.org/security/2020/dsa-4652 third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html third party advisory vendor advisory
https://security.netapp.com/advisory/ntap-20200416-0002/ third party advisory
https://usn.ubuntu.com/4322-1/ third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-11501?
CVE-2020-11501 has been scored as a high severity vulnerability.
How to fix CVE-2020-11501?
To fix CVE-2020-11501, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-11501 being actively exploited in the wild?
It is possible that CVE-2020-11501 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~28% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.