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Vulnerability record · CVE-2023-5981 · published 28 November 2023

CVE-2023-5981: Debian linux observable discrepancy vulnerability

Debian · Debian Linux

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.

5.9 CVSS 3.1 Medium EPSS 1.3% · top 31.4% CWE-208 · CWE-208CWE-203 · Observable discrepancy
5.9CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2024:0155 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0319 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0399 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0451 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0533 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:1383 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:2094 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-5981 Third Party AdvisoryVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2248445 Issue TrackingThird Party Advisory
https://gnutls.org/security-new.html#GNUTLS-SA-2023-10-23 Issue TrackingVendor Advisory
http://www.openwall.com/lists/oss-security/2024/01/19/3 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0155 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0319 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0399 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0451 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:0533 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:1383 Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:2094 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-5981 Third Party AdvisoryVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2248445 Issue TrackingThird Party Advisory
https://gnutls.org/security-new.html#GNUTLS-SA-2023-10-23 Issue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/11/msg00016.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/7ZEIOLORQ7N6WRPFXZSYDL2MC Broken Link
https://lists.fedoraproject.org/archives/list/[email protected]/message/GNXKVR5YNUEBNHAHM5GSYKBZX Broken Link

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Source: NIST National Vulnerability Database (record CVE-2023-5981), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.