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CVE-2021-44227
Cross-Site Request Forgery (CSRF) in mailman (CVE-2021-44227)
Summary
vulnerability in mailman (CVE-2021-44227). Successful exploitation can lead to full system takeover. Mitigation: upgrade to `2.1.38` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2021-44227** has been found in mailman.
Successful exploitation can lead to full system takeover. CVSS score: ?/10.
What to do: upgrade mailman to **2.1.38** or later.
If unsure, ask your IT team or search "mailman CVE-2021-44227" on the vendor's site.
CVE-2021-44227 (mailman) — CWE-352 /
Attack vector: remote (network-reachable) / unauthenticated
Patched: `2.1.38` — 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
**CSRF** (CWE-352) exists in mailman.
📍 Affected scope
mailman — .
🔥 Severity
Severity: ?. Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **2.1.38**.
🛡️ 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 'mailman' .` 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
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1Identify exposure identify
grep -r 'mailman' . | 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 `mailman` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade mailman to 2.1.38ステージング環境で 2.1.38 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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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。
Affected packages
PyPI
mailman
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.38"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2021-44227
- advisory https://github.com/advisories/GHSA-xq58-69h2-765m
- package https://gitlab.com/mailman/mailman
- package https://pypi.org/project/mailman
- web https://bugs.launchpad.net/mailman/+bug/1952384
- web https://lists.debian.org/debian-lts-announce/2022/06/msg00011.html