PatchTheCVECVE-2024-0553: A vulnerability was found in GnuTLS
CVE-2024-0553 is a high-severity flaw (CVSS 7.5) affecting gnutls, fedora, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.6% (top 24%) |
| CISA exploited list | No |
| Weakness | CWE-203 |
| Published | 2024-01-16 |
| Last modified | 2026-11-05 |
Last updated 2026-11-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-0553?
gnutls: upgrade to 3.8.3; fedora: mitigate or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2024-0553 being exploited?
CVE-2024-0553 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-0553 affect?
CVE-2024-0553 affects gnutls, fedora, enterprise linux. Severity is high (CVSS 7.5). 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
How urgent is CVE-2024-0553?
Priority 60/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist
Software pages
Related CVEs
- CVE-2024-0567 HIGH 7.5 UPGRADE MITIGATE A vulnerability was found in GnuTLS, where a cockpit (which uses gnuTLS) rejects a certificate chain with dist
- CVE-2023-5981 MEDIUM 5.9 MITIGATE UPGRADE A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ
- CVE-2026-42010 HIGH 7.1 MITIGATE MITIGATE A flaw was found in gnutls
- CVE-2026-42009 HIGH 7.5 MITIGATE MITIGATE A flaw was found in gnutls
- CVE-2026-33845 HIGH 7.5 MITIGATE DOWNGRADE A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leadi