CVE-2023-5981

MEDIUMNVD 5.97.4▲

5.9

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.

CVSS v3: 5.9
EG Score: 7.4(medium)
EPSS: 75.0%
KEV: Not listed

Published

November 28, 2023

Last Modified

March 25, 2026

References (24)

secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0155
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0319
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0399
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0451
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0533
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:1383
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2094
secalert@redhathttps://access.redhat.com/security/cve/CVE-2023-5981
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2248445
secalert@redhathttps://gnutls.org/security-new.html#GNUTLS-SA-2023-10-23
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/01/19/3
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:0155
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:0319
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:0399
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2024:0451

Patch Availability(9)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libgnutlsxx28 (3.5.18-1ubuntu1.6+esm1) @ bionic	2026-05-24	ubuntu
ubuntu	libgnutls30 (3.8.1-4ubuntu1.1) @ mantic	2026-05-24	ubuntu
redhat	openshift-logging/vector-rhel9:v0.28.1-56	2024-05-01	redhat
redhat	odf4/rook-ceph-rhel9-operator:v4.15.0-103	2024-03-19	redhat
redhat	gnutls-0:3.7.6-23.el9_3.3	2024-01-29	redhat
redhat	gnutls-0:3.7.6-21.el9_2.1	2024-01-25	redhat
redhat	gnutls-0:3.6.16-7.el8_8.1	2024-01-24	redhat
redhat	gnutls-0:3.6.16-5.el8_6.2	2024-01-22	redhat
redhat	gnutls-0:3.6.16-8.el8_9	2024-01-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(10)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:40 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 13:14 UTCEG score recompute
2026-05-24 13:14 UTCVendor advisory
2026-05-24 13:14 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-5981?

CVE-2023-5981 is a medium vulnerability published on November 28, 2023. 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.

When was CVE-2023-5981 disclosed?

CVE-2023-5981 was first published in the National Vulnerability Database on November 28, 2023, with the most recent update on March 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-5981 actively exploited?

CVE-2023-5981 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-5981?

CVE-2023-5981 has a CVSS v3 base score of 5.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.4.

How do I remediate CVE-2023-5981?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-5981, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-5981

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CVE-2023-5981

Published

Last Modified

References (24)

Patch Availability(9)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-5981?

Same vendor

Same CWE

CVE-2023-5981

📅 Published

🔄 Last Modified

🔗 References (24)

Patch Availability(9)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-5981?

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References (24)

Frequently asked(5)

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