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SRC: CVELISTV5 / SYNC: T-4M / LAG: 4M / REC: 386,710 / REV: C6-1C / V4

01 RecordSTATE: PUBLISHED

CVE-2025-9820

Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

MediumPUBLISHEDCNA: redhat

CNA base score4.0 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

02 Description

CNA: redhat

Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

03 Exploitation and scoring

SRC: CISA, FIRST, NVD, RED HAT

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.21% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 10.6% of scored records. A rank, not a probability.

NVD base score

4.0 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-01.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

SCHEMA: 5.2

Published

2026-01-26 19:58Z7 MO AGO

Last updated

2026-09-01 12:08Z3 DAYS AGO

Reserved

2025-09-02

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Medium (CVSS 4.0)

CNA CVSS vector

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

Weaknesses

CWE-121Stack-based Buffer OverflowVariant

Data version

5.2

Document digest

8f428f178c5d0760e640c468b28de2cc199356327c22c7365802d62cb3a1a3de

05 Affected products

PAIRS: 12

VendorProductVersionsPlatforms

Red HatRed Hat Enterprise Linux 10Not specified—

Red HatRed Hat Enterprise Linux 8Not specified—

Red HatRed Hat Enterprise Linux 9Not specified—

Red HatRHEL-8 based Middleware ContainersNot specified—

Red HatRed Hat Ceph Storage 8Not specified—

Red HatRed Hat Discovery 2Not specified—

Red HatRed Hat Hardened ImagesNot specified—

Red HatRed Hat Insights proxy 1.5Not specified—

Red HatRed Hat Update Infrastructure 5Not specified—

Red HatRed Hat Enterprise Linux 6Not specified—

Red HatRed Hat Enterprise Linux 7Not specified—

Red HatRed Hat OpenShift Container Platform 4Not specified—

06 References

REFS: 16

access.redhat.comRHSA-2026:13812https://access.redhat.com/errata/RHSA-2026:13812vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:3477https://access.redhat.com/errata/RHSA-2026:3477vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:4188https://access.redhat.com/errata/RHSA-2026:4188vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:4655https://access.redhat.com/errata/RHSA-2026:4655vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:4943https://access.redhat.com/errata/RHSA-2026:4943vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:5585https://access.redhat.com/errata/RHSA-2026:5585vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:5606https://access.redhat.com/errata/RHSA-2026:5606vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:7329https://access.redhat.com/errata/RHSA-2026:7329vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2026:7477https://access.redhat.com/errata/RHSA-2026:7477vendor-advisoryx_refsource_REDHAT
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2025-9820vdb-entryx_refsource_REDHAT
bugzilla.redhat.comRHBZ#2392528https://bugzilla.redhat.com/show_bug.cgi?id=2392528issue-trackingx_refsource_REDHAT
gitlab.comhttps://gitlab.com/gnutls/gnutls/-/commit/1d56f96f6ab5034d677136b9d50b5a75dff0faf5
gitlab.comhttps://gitlab.com/gnutls/gnutls/-/issues/1732
www.gnutls.orghttps://www.gnutls.org/security-new.html#GNUTLS-SA-2025-11-18
www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/11/20/2
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-032379.html