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Vulnerabilities/CVE-2025-6021Public Intelligence Dossier
Source: xmlsoft · Limited verification•Last verified: •Collection Degraded
CVE-2025-6021Unknown / EvaluatingHIGH (raw)CVSS 7.5CWE-787

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow

Published: 12 Jun 2025•Last updated: 13 Oct 2026, 02:47 AM IST•Source identifier: secalert@redhat.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
7.5HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Metric sourcesecalert@redhat.com
EPSS probability
1.4%0.014
Percentile71st
Weakness type
CWE-787
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

SOC priority

High

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; HIGH severity; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

20 source-backed products
Affected products and versions (source)
  • xmlsoft libxml2 · < 2.14.4 · NVD CPE · Source
  • redhat jboss core services · version range not provided by source · NVD CPE · Source
  • redhat openshift container platform · 4.12; 4.13; 4.14; 4.15; 4.16; 4.17; 4.18; for arm64 4.13; for arm64 4.14; for arm64 4.15; for arm64 4.16; for arm64 4.17; for arm64 4.18; for ibm z 4.13; for ibm z 4.14; for ibm z 4.15; for ibm z 4.16; for ibm z 4.17; for ibm z 4.18; for linuxone 4.13; for linuxone 4.14; for linuxone 4.15; for linuxone 4.16; for linuxone 4.17; for linuxone 4.18; for power 4.13; for power 4.14; for power 4.15; for power 4.16; for power 4.17; for power 4.18 · NVD CPE · Source
  • redhat openshift container platform for arm64 · 4.13; 4.14; 4.15; 4.16; 4.17; 4.18 · NVD CPE · Source
  • redhat openshift container platform for ibm z · 4.13; 4.14; 4.15; 4.16; 4.17; 4.18 · NVD CPE · Source
  • redhat openshift container platform for linuxone · 4.13; 4.14; 4.15; 4.16; 4.17; 4.18 · NVD CPE · Source
  • redhat openshift container platform for power · 4.13; 4.14; 4.15; 4.16; 4.17; 4.18 · NVD CPE · Source
  • redhat enterprise linux · 8.0; 9.0; 10.0; eus 8.4; eus 8.6; eus 8.8; eus 9.4; eus 9.6 · NVD CPE · Source
  • redhat enterprise linux eus · 8.4; 8.6; 8.8; 9.4; 9.6 · NVD CPE · Source
  • redhat enterprise linux for arm 64 · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux for arm 64 eus · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux for ibm z systems · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux for ibm z systems eus · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux for power little endian · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux for power little endian eus · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux server · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux server aus · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux server for power little endian update services for sap solutions · version range not provided by source · NVD CPE · Source
  • redhat enterprise linux server tus · version range not provided by source · NVD CPE · Source
  • redhat in-vehicle operating system · version range not provided by source · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secalert@redhat.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*, cpe:2.3:a:redhat:jboss_core_services:-:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.13:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.14:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.15:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.16:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.17:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform:4.18:*:*:*:*:*:*:*, cpe:2.3:a:redhat:openshift_container_platform_for_arm64:4.13:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
gitlab.gnome.orgSource recordnvd.nist.govSource recordaccess.redhat.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-6021
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-6021
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-6021"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library
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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.