LiveActive security incident?Get immediate response
CVE Record

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

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.

MediumCVSS 6.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A flaw in GnuTLS certtool can corrupt memory when it parses a specially formed template file. The likely result is a crash or denial of service; the supplied evidence does not show confidentiality impact or code execution. Business risk is greatest where automated systems accept templates from untrusted or externally influenced sources.

Executive priority

Schedule remediation promptly through normal vulnerability-management processes. This is not an emergency based on supplied evidence, but priority should increase where certificate automation consumes untrusted templates or supports critical operations. Track RHEL 6 and 7 separately because their status remains unknown.

Technical view

An off-by-one heap buffer overflow in certtool template parsing permits an out-of-bounds NULL write. This can cause memory corruption, limited integrity impact, and availability loss. The supplied CVSS 3.1 score is 6.5. Multiple Red Hat packages are listed as affected, while exact upstream affected and fixed ranges are not supplied.

Likely exposure

Exposure includes listed GnuTLS packages in RHEL 8, 9, and 10, certain RHEL lifecycle variants, Ceph Storage 7, Discovery 2, Hardened Images, Insights proxy, and OpenShift 4. RHEL 6 and 7 status is unknown. Practical risk depends on whether certtool processes attacker-influenced templates.

Exploitation context

The supplied record does not identify active exploitation, and the CVE is not listed as KEV. Exploitation evidence is therefore incomplete, not negative proof. The documented pathway requires certtool to parse a crafted template; no evidence supplied supports remote code execution or information disclosure.

Researcher notes

The vulnerable component is certtool template parsing, not necessarily every use of the GnuTLS library. The bundle lists vendor-specific affected packages but marks the generic libgnutls entry unaffected by default. Exact upstream version boundaries and fixed package versions are absent, so validate against each referenced vendor advisory.

Mitigation direction

  • Review Red Hat CVE guidance and map deployed products to their applicable security advisories.
  • Apply vendor-provided package or product updates after standard compatibility testing.
  • Prioritize automated certtool workflows that process externally supplied or attacker-influenced templates.
  • Until updated, restrict template processing to trusted administrative sources where operationally feasible.

Validation and detection

  • Inventory installed GnuTLS packages and compare versions with the affected product entries.
  • Determine whether certtool is installed, invoked automatically, or exposed to untrusted template inputs.
  • Confirm updated packages correspond to the applicable Red Hat security advisory.
  • After remediation, retest certificate automation and monitor for certtool crashes or memory-corruption indicators.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-122: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2025-32990 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
2ADP providers
14Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L3.92.5redhat

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2025-32990Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Reported to Red Hat.

  2. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  3. Source timelineredhat

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Unknown vendorlibgnutlslibgnutls, 0unaffected
Red HatRed Hat Enterprise Linux 10gnutls, 0:3.8.9-9.el10_0.14affected
Red HatRed Hat Enterprise Linux 8gnutls, 0:3.6.16-8.el8_10.4affected
Red HatRed Hat Enterprise Linux 8gnutls, 0:3.6.16-8.el8_10.4affected
Red HatRed Hat Enterprise Linux 9gnutls, 0:3.8.3-6.el9_6.2affected
Red HatRed Hat Enterprise Linux 9gnutls, 0:3.8.3-6.el9_6.2affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionsgnutls, 0:3.7.6-21.el9_2.4affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportgnutls, 0:3.8.3-4.el9_4.4affected
Red HatRed Hat Ceph Storage 7rhceph/rhceph-7-rhel9, 7affected
Red HatRed Hat Discovery 2discovery/discovery-ui-rhel9, 2.3.0-1760554384affected
Red HatRed Hat Hardened Imagesgnutls-main, 3.8.12-1.1.hum1affected
Red HatRed Hat Insights proxy 1.5insights-proxy/insights-proxy-container-rhel9, 1.5.7-1759331989affected
Red HatRed Hat Enterprise Linux 6gnutlsunknown
Red HatRed Hat Enterprise Linux 7gnutlsunknown
Red HatRed Hat OpenShift Container Platform 4openshift/ose-rhel-coreos-9affected
Weakness

CWE details

CWE-122

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-122 · source CWE mapping

Heap-based Buffer Overflow

Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs