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CVE-2020-11501

GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is...

7.4 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

3.39%Up 1.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.4

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.

Record
CVE-2020-11501
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0
5.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:N
Weakness
CWE-330
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2020-11501
Updated
2026-11-02
EUVDEUVD-2020-3854 No score

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.

Record
EUVD-2020-3854
Updated
2026-11-02
GitHub AdvisoriesGHSA-j883-wjrw-g444 7.4

GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is...

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.

Record
GHSA-j883-wjrw-g444
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-327, CWE-330
Updated
2026-11-02
OSVALPINE-CVE-2020-11501 7.4

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.

Record
ALPINE-CVE-2020-11501
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVBELL-CVE-2020-11501 7.4

CVE-2020-11501 does not affect BellSoft software

Record
BELL-CVE-2020-11501
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
Show 8 moreShow less
OSV 7.4

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.

Record
CVE-2020-11501
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-11501 7.4

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.

Record
DEBIAN-CVE-2020-11501
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVRHSA-2020:1998 7.4

Red Hat Security Advisory: gnutls security update

Record
RHSA-2020:1998
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2020-11501 7.4

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.

Record
UBUNTU-CVE-2020-11501
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVMGASA-2020-0168 No score

Updated gnutls packages fix security vulnerability

Updated gnutls packages fix security vulnerability:

A flaw was reported in the DTLS protocol implementation in GnuTLS. The DTLS client would not contribute any randomness to the DTLS negotiation, breaking the security guarantees of the DTLS protocol (CVE-2020-11501).

Record
MGASA-2020-0168
Updated
2026-11-02
OSVopenSUSE-SU-2020:0501-1 No score

Security update for gmp, gnutls, libnettle

This update for gmp, gnutls, libnettle fixes the following issues:

Security issue fixed:

  • CVE-2020-11501: Fixed zero random value in DTLS client hello (bsc#1168345)

FIPS related bugfixes:

  • FIPS: Install checksums for binary integrity verification which are required when running in FIPS mode (bsc#1152692, jsc#SLE-9518)
  • FIPS: Fixed a cfb8 decryption issue, no longer truncate output IV if input is shorter than block size. (bsc#1166881)
  • FIPS: Added Diffie Hellman public key verification test. (bsc#1155327)

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2020:0501-1
Updated
2026-11-02
OSVSUSE-SU-2020:0948-1 No score

Security update for gmp, gnutls, libnettle

This update for gmp, gnutls, libnettle fixes the following issues:

Security issue fixed:

  • CVE-2020-11501: Fixed zero random value in DTLS client hello (bsc#1168345)

FIPS related bugfixes:

  • FIPS: Install checksums for binary integrity verification which are required when running in FIPS mode (bsc#1152692, jsc#SLE-9518)
  • FIPS: Fixed a cfb8 decryption issue, no longer truncate output IV if input is shorter than block size. (bsc#1166881)
  • FIPS: Added Diffie Hellman public key verification test. (bsc#1155327)
Record
SUSE-SU-2020:0948-1
Updated
2026-11-02
OSVSUSE-SU-2020:0948-2 No score

Security update for gmp, gnutls, libnettle

This update for gmp, gnutls, libnettle fixes the following issues:

Security issue fixed:

  • CVE-2020-11501: Fixed zero random value in DTLS client hello (bsc#1168345)

FIPS related bugfixes:

  • FIPS: Install checksums for binary integrity verification which are required when running in FIPS mode (bsc#1152692, jsc#SLE-9518)
  • FIPS: Fixed a cfb8 decryption issue, no longer truncate output IV if input is shorter than block size. (bsc#1166881)
  • FIPS: Added Diffie Hellman public key verification test. (bsc#1155327)
Record
SUSE-SU-2020:0948-2
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
gnutls
Alpine:v3.10
 3.6.3 up to 3.6.8-r1
3.6.8-r1
gnutls
Alpine:v3.12
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.13
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.14
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.15
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.16
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.17
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.18
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.19
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.20
 3.6.3 up to 3.6.13-r0
3.6.13-r0
Show 47 moreShow less
Affected packages
PackageAffectedFixed
gnutls
Alpine:v3.21
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.22
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.23
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.24
 3.6.3 up to 3.6.13-r0
3.6.13-r0
gnutls
Alpine:v3.8
 3.6.3 up to 3.6.7-r1
3.6.7-r1
gnutls
Alpine:v3.9
 3.6.3 up to 3.6.7-r1
3.6.7-r1
gnutls28
Debian:12
 before 3.6.13-2
3.6.13-2
gnutls28
Debian:13
 before 3.6.13-2
3.6.13-2
gnutls28
Debian:14
 before 3.6.13-2
3.6.13-2
gnutls28
Debian:10
 before 3.6.7-4+deb10u3, plus listed versions
3.6.7-43.6.7-4+deb10u13.6.7-4+deb10u2
3.6.7-4+deb10u3
gnutls
Mageia:7
 before 3.6.7-1.1.mga7
3.6.7-1.1.mga7
gnutls-c++
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-c++-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-dane
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-dane-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-debugsource
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-devel
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-utils
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-utils-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls
Red Hat:enterprise_linux:8::baseos
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-c++-debuginfo
Red Hat:enterprise_linux:8::baseos
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-dane-debuginfo
Red Hat:enterprise_linux:8::baseos
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-debuginfo
Red Hat:enterprise_linux:8::baseos
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-debugsource
Red Hat:enterprise_linux:8::baseos
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gnutls-utils-debuginfo
Red Hat:enterprise_linux:8::baseos
 before 0:3.6.8-10.el8_2
0:3.6.8-10.el8_2
gmp
SUSE:Linux Enterprise Module for Basesystem 15 SP1
 before 6.1.2-4.3.1
6.1.2-4.3.1
gnutls
SUSE:Linux Enterprise Module for Basesystem 15 SP1
 before 3.6.7-6.14.1
3.6.7-6.14.1
libnettle
SUSE:Linux Enterprise Module for Basesystem 15 SP1
 before 3.4.1-4.12.1
3.4.1-4.12.1
gmp
SUSE:Linux Enterprise Module for Development Tools 15 SP1
 before 6.1.2-4.3.1
6.1.2-4.3.1
gmp
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
 before 6.1.2-4.3.1
6.1.2-4.3.1
gnutls
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
 before 3.6.7-6.14.1
3.6.7-6.14.1
libnettle
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
 before 3.4.1-4.12.1
3.4.1-4.12.1
gmp
SUSE:Linux Enterprise High Performance Computing 15-LTSS
 before 6.1.2-4.3.1
6.1.2-4.3.1
gnutls
SUSE:Linux Enterprise High Performance Computing 15-LTSS
 before 3.6.7-6.14.1
3.6.7-6.14.1
libnettle
SUSE:Linux Enterprise High Performance Computing 15-LTSS
 before 3.4.1-4.12.1
3.4.1-4.12.1
gmp
SUSE:Linux Enterprise Server 15-LTSS
 before 6.1.2-4.3.1
6.1.2-4.3.1
gnutls
SUSE:Linux Enterprise Server 15-LTSS
 before 3.6.7-6.14.1
3.6.7-6.14.1
libnettle
SUSE:Linux Enterprise Server 15-LTSS
 before 3.4.1-4.12.1
3.4.1-4.12.1
gmp
SUSE:Linux Enterprise Server for SAP Applications 15
 before 6.1.2-4.3.1
6.1.2-4.3.1
gnutls
SUSE:Linux Enterprise Server for SAP Applications 15
 before 3.6.7-6.14.1
3.6.7-6.14.1
libnettle
SUSE:Linux Enterprise Server for SAP Applications 15
 before 3.4.1-4.12.1
3.4.1-4.12.1
gmp
SUSE:Linux Enterprise Module for Certifications 15 SP3
 before 6.1.2-4.3.1
6.1.2-4.3.1
libnettle
SUSE:Linux Enterprise Module for Certifications 15 SP3
 before 3.4.1-4.12.1
3.4.1-4.12.1
gmp
openSUSE:Leap 15.1
 before 6.1.2-lp151.4.3.1
6.1.2-lp151.4.3.1
gnutls
openSUSE:Leap 15.1
 before 3.6.7-lp151.2.6.1
3.6.7-lp151.2.6.1
libnettle
openSUSE:Leap 15.1
 before 3.4.1-lp151.2.3.2
3.4.1-lp151.2.3.2

History

History
RecordedChangedSources
affected
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-11501 is a high vulnerability (CVSS 7.4) in Gnu Gnutls, published April 3, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.39%, the 88th percentile. Fixed in gnutls 3.6.8-r1.

References

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