{"id":"CVE-2023-5981","title":"A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.","summary":"A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-208","CWE-203"],"vendor":"gnu","product":"gnutls","affected":["debian_linux = 10.0","gnutls < 3.8.2","linux = 8.0","linux = 9.0","fedora = 37","fedora = 38"],"patched":["gnutls 3.8.2"],"published":"2023-11-28","updated":"2026-10-14","sourceUpdated":"2026-10-14T22:17:21.480","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-5981","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:0155","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:0319","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:0399","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:0451","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:0533","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:1383","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:2094","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2023-5981","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2248445","label":"secalert@redhat.com"},{"url":"https://gnutls.org/security-new.html#GNUTLS-SA-2023-10-23","label":"secalert@redhat.com"},{"url":"http://www.openwall.com/lists/oss-security/2024/01/19/3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:0155","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:0319","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:0399","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:0451","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:0533","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:1383","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:2094","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/CVE-2023-5981","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2248445","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gnutls.org/security-new.html#GNUTLS-SA-2023-10-23","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/11/msg00016.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7ZEIOLORQ7N6WRPFXZSYDL2MC4LP7VFV/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GNXKVR5YNUEBNHAHM5GSYKBZX4W2HMN2/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.01267,"epssPercentile":0.69201,"ingestedAt":"2026-10-14T23:00:02.007Z","slug":"CVE-2023-5981","body":"## Overview\n\nA vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.\n\n## Affected\n\n- `debian_linux = 10.0`\n- `gnutls < 3.8.2`\n- `linux = 8.0`\n- `linux = 9.0`\n- `fedora = 37`\n- `fedora = 38`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `gnutls 3.8.2`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}