High 7.4Published Apr 3, 2020

CVE-2020-11501GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS.

Updated under an hour ago (Oct 26, 2026, 5:10 PM ET)

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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 7 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

Exploited in the last 30 days

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.

CVSS: 7.4 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
gnu gnutls gnu:gnutls	from 3.6.3 before 3.6.13	NVD
canonical ubuntu_linux canonical:ubuntu_linux	19.10	NVD
debian debian_linux debian:debian_linux	10.0	NVD
opensuse leap opensuse:leap	15.1	NVD
fedoraproject fedora fedoraproject:fedora	31; 32	NVD

References

References

https://security.gentoo.org/glsa/202004-06	vendor-advisory, x-refsource-gentoo, third-party-advisory
https://gitlab.com/gnutls/gnutls/-/issues/960	x-refsource-misc, issue-tracking, patch, third-party-advisory
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2	x-refsource-misc, patch, third-party-advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31	x-refsource-misc, vendor-advisory
https://www.debian.org/security/2020/dsa-4652	vendor-advisory, x-refsource-debian, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html	vendor-advisory, x-refsource-suse, third-party-advisory
https://security.netapp.com/advisory/ntap-20200416-0002/	x-refsource-confirm, third-party-advisory
https://usn.ubuntu.com/4322-1/	vendor-advisory, x-refsource-ubuntu, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/	vendor-advisory, x-refsource-fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/	vendor-advisory, x-refsource-fedora
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.