7.5

CVE-2025-6021: redhat enterprise_linux Out-of-bounds Write

CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2025-6021UBUNTU-CVE-2025-6021DEBIAN-CVE-2025-6021
Published 12-06-2025Last modified 12-10-2026
Open JSON

Vulnerability summary

CVE-2025-6021 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in redhat enterprise_linux. EPSS estimates a 1.37% chance of exploitation in the next 30 days, higher than 71.3% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 23 · Related 10
DLA-4251-1MGASA-2025-0269OPENSUSE-SU-2025:15321-1RHSA-2025:10630RHSA-2025:10698RHSA-2025:10699

Timeline

  1. 12-06-2025
    PublishedVulnerability first disclosed.
  2. 12-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

1.37%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

0.00 pp

From 1.37% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (gitlab.gnome.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Chainguard39 products
  • openjdk-11-openj9< 0.59.0-r2
  • openjdk-11-openj9-dbg< 0.59.0-r2
  • openjdk-11-openj9-default-jdk< 0.59.0-r2
  • openjdk-11-openj9-default-jvm< 0.59.0-r2
  • openjdk-11-openj9-doc< 0.59.0-r2
Redhat19 products
Alpine1 product
  • libxml2< 2.13.9-r0
Debian1 product
  • libxml2< 2.9.14+dfsg-1.3~deb12u3 | < 2.12.7+dfsg+really2.9.14-2
Ubuntu1 product
  • libxml2< 2.9.1+dfsg1-3ubuntu4.13+esm8 | < 2.9.3+dfsg1-1ubuntu0.7+esm9 | < 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | < 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | < 2.9.13+dfsg-1ubuntu0.8 | < 2.9.14+dfsg-1.3ubuntu3.4
Xmlsoft1 product

6 vendors · 62 products

References

38 links
Show all 38 references