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Vulnerability record · CVE-2024-0553 · published 16 January 2024

CVE-2024-0553: Gnutls observable discrepancy vulnerability

Gnu · Gnutls

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

7.5 CVSS 3.1 High EPSS 1.6% · top 25.0% CWE-203 · Observable discrepancy
7.5CVSS 3.1 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
27References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A vulnerability was found in GnuTLS. The response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from the response times of ciphertexts with correct PKCS#1 v1.5 padding. This issue may allow a remote attacker to perform a timing side-channel attack in the RSA-PSK key exchange, potentially leading to the leakage of sensitive data. CVE-2024-0553 is designated as an incomplete resolution for CVE-2023-5981.

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

Affected products

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

References

LinkTags
https://access.redhat.com/errata/RHSA-2024:0533
https://access.redhat.com/errata/RHSA-2024:0627
https://access.redhat.com/errata/RHSA-2024:0796
https://access.redhat.com/errata/RHSA-2024:1082
https://access.redhat.com/errata/RHSA-2024:1108
https://access.redhat.com/errata/RHSA-2024:1383
https://access.redhat.com/errata/RHSA-2024:2094
https://access.redhat.com/security/cve/CVE-2024-0553 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2258412 Issue TrackingThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/1522 ExploitIssue TrackingVendor Advisory
https://lists.gnupg.org/pipermail/gnutls-help/2024-January/004841.html Mailing List
http://www.openwall.com/lists/oss-security/2024/01/19/3
https://access.redhat.com/errata/RHSA-2024:0533
https://access.redhat.com/errata/RHSA-2024:0627
https://access.redhat.com/errata/RHSA-2024:0796
https://access.redhat.com/errata/RHSA-2024:1082
https://access.redhat.com/errata/RHSA-2024:1108
https://access.redhat.com/errata/RHSA-2024:1383
https://access.redhat.com/errata/RHSA-2024:2094
https://access.redhat.com/security/cve/CVE-2024-0553 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2258412 Issue TrackingThird Party Advisory
https://gitlab.com/gnutls/gnutls/-/issues/1522 ExploitIssue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2024/02/msg00010.html
https://lists.fedoraproject.org/archives/list/[email protected]/message/7ZEIOLORQ7N6WRPFXZSYDL2MC
https://lists.fedoraproject.org/archives/list/[email protected]/message/GNXKVR5YNUEBNHAHM5GSYKBZX
https://lists.gnupg.org/pipermail/gnutls-help/2024-January/004841.html Mailing List
https://security.netapp.com/advisory/ntap-20240202-0011/

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Source: NIST National Vulnerability Database (record CVE-2024-0553), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.