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CVE-2021-3987
Vulnerability in calibreweb (CVE-2021-3987)
Summary
vulnerability in calibreweb (CVE-2021-3987). Risk of unauthorized operations or information disclosure. Exploitable via ``create_shelf``. Mitigation: upgrade to `0.6.15` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2021-3987** has been found in calibreweb.
Attackers can target a specific entry point like ``create_shelf`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade calibreweb to **0.6.15** or later.
If unsure, ask your IT team or search "calibreweb CVE-2021-3987" on the vendor's site.
CVE-2021-3987 (calibreweb) — CWE-284 /
Attack vector: remote (network-reachable) / no user interaction
Attack surface: `create_shelf` / `shelf.py`
Patched: `0.6.15` — 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
**A vulnerability** (CWE-284) exists in calibreweb. Attackers reach the vulnerable code path via ``create_shelf`` without authentication.
📍 Affected scope
calibreweb — . Attack surface: `create_shelf` / `shelf.py`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.6.15**.
🛡️ 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 'calibreweb' .` 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 'calibreweb' . | 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 `calibreweb` 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 calibreweb to 0.6.15ステージング環境で 0.6.15 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
calibreweb
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.15"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2021-3987
- advisory https://github.com/advisories/GHSA-fj5v-w2jp-wqvj
- package https://github.com/janeczku/calibre-web
- package https://pypi.org/project/calibreweb
- patch https://github.com/janeczku/calibre-web/commit/bcdc97641447965af486964537f3821f47b28874
- report https://huntr.com/bounties/29fcc091-87b6-43bc-ab4b-3c0bec3f71df