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Vulnerabilities

Vulnerability · CVE-2025-6021

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 Jun 12, 2025 · catalog updated Oct 12, 2026 · Red Hat Red Hat OpenShift Container Platform 4.18

Check if you run it

No confirmed exploitation is on record for CVE-2025-6021. EPSS is 1.37%. Act only if a listed version of Red Hat Red Hat OpenShift Container Platform 4.18 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.37%
Remediation
Vendor / distro source
Affected products
vendor Red Hat Red Hat OpenShift Container Platform 4.18 patch: 418.94.202508060022-0

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Red Hat Red Hat OpenShift Container Platform 4.18 patch: 418.94.202508060022-0patch: 418.94.202508060022-0

How to fix CVE-2025-6021

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-6021. EPSS is 1.37%. Act only if a listed version of Red Hat Red Hat OpenShift Container Platform 4.18 is installed.

Which versions are affected?

Compare what you have installed with Red Hat Red Hat OpenShift Container Platform 4.18 patch: 418.94.202508060022-0 patch: 418.94.202508060022-0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Kubernetes security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 12, 2025 · EUVD

    Detected

    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.

  2. Oct 12, 2026 · EUVD

    Updated

    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.

Sources

  • FIRST EPSSExploitation probabilityCVE-2025-6021

    30-day exploitation probability 1.4%

    first.org
  • EUVDVulnerability recordEUVD-2025-18175

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.