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CVE-2021-20231: gnutls from 3.6.3 (inclusive), before 3.7.1 (exclusive), gnutls 3.7.1; +7 more affected products
CVE-2021-20231. CVSS 3.1 base score 9.8 (CRITICAL, NVD). EPSS 0.03751 (percentile 0.89646), scored 13-Oct-2026.
Affected technology
gnutls · from 3.6.3 (inclusive), before 3.7.1 (exclusive)
gnu
enterprise linux · 8.0
redhat
fedora · 34
fedoraproject
active iq unified manager · Version not applicable in the source CPE
netapp
e-series performance analyzer · Version not applicable in the source CPE
netapp
gnutls · gnutls 3.7.1
Vendor not specified by the source
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · V3.1.0 to before V3.1.5
Siemens
Component: Not specified by the source
Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
NVD’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.
- CWE
- CWE-416
- CCR priority
- 40.1 /100 (P3)
- CVSS 3.1
- 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · NVD
- EPSS
- 0.03751 · percentile 0.89646 · 2026-10-13
- KEV
- no
Provenance
- GitHub Advisory Database · Source record · observed 2026-10-14 16:01:16.619248+00:00 UTC
- NVD CVE API 2.0 · Source record · observed 2026-10-14 15:56:36.793806+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2021-20231.html