CVE-2023-5981
No exploitation reported by the sources we read.
- Published2023-11-28
- WeaknessCWE-203 · CWE-208
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2023-11-2812:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-5981?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-5981?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 37.x | = 37 | no fix published | NVD |
| 38.x | = 38 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 10.0 | = 10.0 | no fix published | NVD |
1 more product in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- gnutlsAlmaLinux:9all versions · fixed in 3.7.6-23.el9_3.3and 4 other packages
- gnutlsAlmaLinux:8all versions · fixed in 3.6.16-8.el8_9.1and 4 other packages
- gnutlsAlmaLinux:8all versions · fixed in 3.6.16-8.el8_9and 4 other packages
Fix
Advisories and patches
- access.redhat.comVendor Advisory
- gnutls.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- 2023-11-28
- Last Modified
- 2026-10-14
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-5981?
Is CVE-2023-5981 actively exploited?
What is the CVSS score for CVE-2023-5981?
Running gnutls? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.