CVE-2020-11501GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS.
Updated under an hour ago ()
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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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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
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
- https://security.gentoo.org/glsa/202004-06vendor-advisory, x-refsource-gentoo, third-party-advisory
- https://gitlab.com/gnutls/gnutls/-/issues/960x-refsource-misc, issue-tracking, patch, third-party-advisory
- https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2x-refsource-misc, patch, third-party-advisory
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31x-refsource-misc, vendor-advisory
- https://www.debian.org/security/2020/dsa-4652vendor-advisory, x-refsource-debian, third-party-advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.htmlvendor-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
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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.