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CVE-2025-21767
medium
CVSS 5.5
Vulnerability in c (CVE-2025-21767)
Summary
vulnerability in c (CVE-2025-21767). Risk of unauthorized operations or information disclosure.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-21767** has been found in c.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "c CVE-2025-21767" on the vendor's site.
CVE-2025-21767 (c) — CWE-667 / CVSS v3 5.5
Attack vector: local / no user interaction
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
**A vulnerability** (CWE-667) exists in c.
📍 Affected scope
c — .
🔥 Severity
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ 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 'c' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'c' . | 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 `c` を grep し、稼働しているサービス・バージョンを把握する。
-
7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- web https://git.kernel.org/stable/c/0fb534187d2355f6c8f995321e76d1ccd1262ac1
- web https://git.kernel.org/stable/c/60f54f0d4ea530950549a8263e6fdd70a40490a4
- web https://git.kernel.org/stable/c/6bb05a33337b2c842373857b63de5c9bf1ae2a09
- web https://git.kernel.org/stable/c/852805b6cbdb69c298a8fc9fbe79994c95106e04
- web https://git.kernel.org/stable/c/8783ceeee797d9aa9cfe150690fb9d0bac8cc459
- web https://git.kernel.org/stable/c/cc3d79e7c806cb57d71c28a4a35e7d7fb3265faa
- web https://git.kernel.org/stable/c/d9c217fadfcff7a8df58567517d1e4253f3fd243
- web https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- web https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- web https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- web https://nvd.nist.gov/vuln/detail/CVE-2025-21767
- web https://github.com/advisories/GHSA-h97w-34cr-4pxx