CVE-2023-5981

5.9 MEDIUM 1% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure.
Exploit odds: 1.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-11-28 12:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-11-05 12:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 1.3% in the next 30 days (EPSS).
Severity: 5.9 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-11-28 12:15 UTC
Last modified: 2026-11-05 12:17 UTC
Exploit probability: 1.3% · EPSS, next 30 days
Weakness: CWE-208
Record status: Modified

Affected

Debian Linux 10.0
Gnu Gnutls < 3.8.2
Redhat Linux 8.0
Redhat Linux 9.0
Fedoraproject Fedora 37
Fedoraproject Fedora 38

Attack profile CVSS 3.1 · 5.9

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-5981.md and follow it. Check whether this project is affected by CVE-2023-5981. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record