Vulnerability in bcrypt (CVE-2020-7689)
Summary
Vulnerability in bcrypt (CVE-2020-7689). Data can be tampered with by attackers. Mitigation: upgrade to 5.0.0 or later.
Original description
The description as published by the source.
In bcrypt (npm package) before version 5.0.0, data is truncated wrong when its length is greater than 255 bytes.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2020-7689 has been found in bcrypt.
Data can be tampered with by attackers.
What to do: upgrade bcrypt to 5.0.0 or later.
If unsure, ask your IT team or search "bcrypt CVE-2020-7689" on the vendor's site.
CVE-2020-7689 (bcrypt) — CWE-190
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 5.0.0 — 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.
A vulnerability (CWE-190) exists in bcrypt.
Check the vendor advisory for the affected versions of bcrypt.
Severity: ?. Data can be tampered with by attackers.
Update to 5.0.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'bcrypt' . 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
-
1Identify exposure identify
grep -r 'bcrypt' . | 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
bcryptを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade bcrypt to 5.0.0ステージング環境で 5.0.0 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。
-
3Post-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
References
- advisory nvd.nist.gov
- web github.com
- web github.com
- web github.com
- web snyk.io