HighCVE-2025-32990

    Gnutls: vulnerability in gnutls certtool template parsing (CVE-2025-32990)

    Published Last modified Sources: BSI, Debian LTS, Red Hat, Debian, Msrc Update Guide, CVE.org

    What is affected, what to do

    A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within the certtool utility. When it reads certain settings from a template file, it allows an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service (DoS) that could potentially crash the system.

    Update Libgnutls to version 3.8.10, Red Hat Enterprise Linux 10 to version 0:3.8.9-9.el10_0.14, Red Hat Enterprise Linux 8 to version 0:3.6.16-8.el8_10.4.

    Affected
    • Libgnutls lt *..3.8.10
    • Red Hat Enterprise Linux 10 lt *..0:3.8.9-9.el10_0.14
    • Red Hat Enterprise Linux 8 lt *..0:3.6.16-8.el8_10.4
    • Red Hat Enterprise Linux 9 lt *..0:3.8.3-6.el9_6.2
    • Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions lt *..0:3.7.6-21.el9_2.4
    • Red Hat Enterprise Linux 9.4 Extended Update Support lt *..0:3.8.3-4.el9_4.4
    • Red Hat Ceph Storage 7 lt *..7
    • Red Hat Discovery 2 lt *..2.3.0-1760554384
    • Red Hat Hardened Images lt *..3.8.12-1.1.hum1
    • Red Hat Insights proxy 1.5 lt *..1.5.7-1759331989
    Fixed in
    • Libgnutls 3.8.10
    • Red Hat Enterprise Linux 10 0:3.8.9-9.el10_0.14
    • Red Hat Enterprise Linux 8 0:3.6.16-8.el8_10.4
    • Red Hat Enterprise Linux 9 0:3.8.3-6.el9_6.2
    • Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.7.6-21.el9_2.4
    • Red Hat Enterprise Linux 9.4 Extended Update Support 0:3.8.3-4.el9_4.4
    • Red Hat Ceph Storage 7 7
    • Red Hat Discovery 2 2.3.0-1760554384
    • Red Hat Hardened Images 3.8.12-1.1.hum1
    • Red Hat Insights proxy 1.5 1.5.7-1759331989

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    8.2

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    6.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: BSI, Debian LTS, Red Hat, Debian, Msrc Update Guide, CVE.org

    0.9 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 59.6

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    70.56 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    8.2 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    6.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.9 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    59.6
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 10 July 2025
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-122

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within the certtool utility. When it reads certain settings from a template file, it allows an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service (DoS) that could potentially crash the system.

    Source: BSI WID Portal, BSI CSAF, Debian LTS Advisories, redhat_csaf, Debian Security Advisories, Microsoft Security Update Guide, cvelistv5, NVD (NIST)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    —libgnutls
    • < 3.8.10
    • 3.8.10
    Red HatRed Hat Ceph Storage 7
    • < 7
    • 7
    Red HatRed Hat Discovery 2
    • < 2.3.0-1760554384
    • 2.3.0-1760554384
    Red HatRed Hat Enterprise Linux 10
    • < 0:3.8.9-9.el10_0.14
    • 0:3.8.9-9.el10_0.14
    Red HatRed Hat Enterprise Linux 6
    • —
    • —
    Red HatRed Hat Enterprise Linux 7
    • —
    • —
    Red HatRed Hat Enterprise Linux 8
    • < 0:3.6.16-8.el8_10.4
    • 0:3.6.16-8.el8_10.4
    Red HatRed Hat Enterprise Linux 9
    • < 0:3.8.3-6.el9_6.2
    • 0:3.8.3-6.el9_6.2
    Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
    • < 0:3.7.6-21.el9_2.4
    • 0:3.7.6-21.el9_2.4
    Red HatRed Hat Enterprise Linux 9.4 Extended Update Support
    • < 0:3.8.3-4.el9_4.4
    • 0:3.8.3-4.el9_4.4
    Red HatRed Hat Hardened Images
    • < 3.8.12-1.1.hum1
    • 3.8.12-1.1.hum1
    Red HatRed Hat Insights proxy 1.5
    • < 1.5.7-1759331989
    • 1.5.7-1759331989
    Red HatRed Hat OpenShift Container Platform 4
    • —
    • —
    gnugnutls
    • —
    • —
    redhatopenshift_container_platform
    • 4.0
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxredhatenterprise_linux10.0
    Linuxredhatenterprise_linux6.0
    Linuxredhatenterprise_linux7.0
    Linuxredhatenterprise_linux8.0
    Linuxredhatenterprise_linux9.0
    Linuxdebiangnutls28bookworm
    Linuxdebiangnutls28bullseye

    Weakness classes (CWE)

    • CWE-122Heap-based Buffer Overflow

      Variant

      A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

      Entry at MITRE CWE-122

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedCVE Program

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      http://www.openwall.com/lists/oss-security/2025/07/11/3
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2025/08/msg00005.html
      Referenceremoved
      http://www.openwall.com/lists/oss-security/2025/07/11/3
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2025/08/msg00005.html
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    2. Record modifiedRed Hat

      Show 27 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2025/32xxx/CVE-2025-32990.json">CVE-2025-32990</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:16115
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:16116
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:17181
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:17348
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:17361
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:17415
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:19088
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2025:22529
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:7477
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2025-32990
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2359620
      Referenceadded
      —
      https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:16115
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:16116
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:17181
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:17348
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:17361
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:17415
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:19088
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2025:22529
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:7477
      —
      Referenceremoved
      https://access.redhat.com/security/cve/CVE-2025-32990
      —
      Referenceremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2359620
      —
      Referenceremoved
      https://lists.gnupg.org/pipermail/gnutls-help/2025-July/004883.html
      —
      Reference typeremoved
      https://access.redhat.com/security/cve/CVE-2025-32990 Types: Vendor Advisory
      —
      Reference typeremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2359620 Types: Issue Tracking
      —

      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      …, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+12)
      …, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+12)

      Source identifier: secalert@redhat.com

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