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CVE-2021-28861 high CVSS 7.4

Open Redirect in Python (CVE-2021-28861)

Summary

Vulnerability in Python (CVE-2021-28861). Confidential information can be exposed externally.

Original description

The description as published by the source.

Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."

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-2021-28861 has been found in Python.
Confidential information can be exposed externally. CVSS score: 7.4/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Python CVE-2021-28861" on the vendor's site.

CVE-2021-28861 (Python) — CWE-601 / CVSS v3 7.4
Attack vector: remote (network-reachable) / unauthenticated
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-601) exists in Python.

📍 Affected scope

Check the vendor advisory for the affected versions of Python.

🔥 Severity

Severity: High (CVSS 7.4/10). Confidential information can be exposed externally.

🔧 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 'Python' . 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 'Python' . | 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 Python 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
    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 libpython
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.7.14"},{"introduced":"3.8.0"},{"fixed":"3.8.14"},{"introduced":"3.9.0"},{"fixed":"3.9.14"},{"introduced":"3.10.0"},{"fixed":"3.10.6"}]}]
Bitnami python-min
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.7.14"},{"introduced":"3.8.0"},{"fixed":"3.8.14"},{"introduced":"3.9.0"},{"fixed":"3.9.14"},{"introduced":"3.10.0"},{"fixed":"3.10.6"}]}]
Bitnami python
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.7.14"},{"introduced":"3.8.0"},{"fixed":"3.8.14"},{"introduced":"3.9.0"},{"fixed":"3.9.14"},{"introduced":"3.10.0"},{"fixed":"3.10.6"}]}]

References

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