---
id: CVE-2024-0553
title: A vulnerability was found in GnuTLS
summary: >-
  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 perfo…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-203
vendor: gnu
product: gnutls
affected:
  - gnutls < 3.8.3
  - fedora = 39
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
patched:
  - gnutls 3.8.3
published: '2024-01-16'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:17.377'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-0553'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:0533'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:0627'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:0796'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:1082'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:1108'
    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-2024-0553'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2258412'
    label: secalert@redhat.com
  - url: 'https://gitlab.com/gnutls/gnutls/-/issues/1522'
    label: secalert@redhat.com
  - url: 'https://lists.gnupg.org/pipermail/gnutls-help/2024-January/004841.html'
    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-2024:0533'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:0627'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:0796'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:1082'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:1108'
    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-2024-0553'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2258412'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://gitlab.com/gnutls/gnutls/-/issues/1522'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/02/msg00010.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://lists.gnupg.org/pipermail/gnutls-help/2024-January/004841.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20240202-0011/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.01614
epssPercentile: 0.75502
ingestedAt: '2026-10-15T03:30:12.634Z'
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2024-01-16T15:03:37.625694Z'
---

## Overview

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.

## Affected

- `gnutls < 3.8.3`
- `fedora = 39`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`

## Remediation

Upgrade past the affected range:

- `gnutls 3.8.3`