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CVE-2025-6021 high CVSS 7.5

Out-of-Bounds Write in java (CVE-2025-6021)

Summary

Out-of-bounds write in java (CVE-2025-6021). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.8.0, 8.0.481 or later.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2025-6021 has been found in java.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade java to 1.8.0, 8.0.481 or later.
If unsure, ask your IT team or search "java CVE-2025-6021" on the vendor's site.

CVE-2025-6021 (java) — CWE-787 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.8.0, 8.0.481 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Out-of-bounds write (CWE-787) exists in java.

📍 Affected scope

Check the vendor advisory for the affected versions of java.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.8.0, 8.0.481.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'java' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'java' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で java を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade java to 1.8.0, 8.0.481

    ステージング環境で 1.8.0, 8.0.481 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Bitnami java
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.8.0"},{"introduced":"1.9.0"},{"fixed":"8.0.481"}]}]
Bitnami java-min
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.8.0"},{"introduced":"1.9.0"},{"fixed":"8.0.481"}]}]
Bitnami jre
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.8.0"},{"introduced":"1.9.0"},{"fixed":"8.0.481"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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