CVE-2025-9820 (GCVE-0-2025-9820)

Vulnerability from cvelistv5 – Published: 2026-01-26 19:58 – Updated: 2026-06-30 10:40
VLAI
Title
Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function
Summary
A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.
Severity
4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.8.10-3.el10_1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.1
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:3.6.16-8.el8_10.5 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.8.3-10.el9_7 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-4.1777325677 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
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Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-4.1777325711 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
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Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-4.1777325710 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
 Create a notification for this product.
Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-3.1777325680 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
 Create a notification for this product.
Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-4.1777325709 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
 Create a notification for this product.
Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-4.1777325680 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
 Create a notification for this product.
Red Hat RHEL-8 based Middleware Containers Unaffected: 7.13.5-4.1777325708 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
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Red Hat Red Hat Ceph Storage 8 Unaffected: 1774002867 , < * (rpm)
    cpe:/a:redhat:ceph_storage:8::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1775668717 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1775675922 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Hardened Images Unaffected: 3.8.12-1.1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Insights proxy 1.5 Unaffected: 1773685509 , < * (rpm)
    cpe:/a:redhat:insights_proxy:1.5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1773670073 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1773672059 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1773668803 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1773670137 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Date Public
2025-11-18 00:00
Show details on NVD website
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      "dataVersion": "5.2"
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  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.