CVE-2021-28861 — CVE & Security Advisory Radar

🎯 CVE-2021-28861 MEDIUM 6.5 🔥 EPSS 2.5% 🧪 PoC 🇪🇺 EUVD

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CVE-2021-28861 | 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."

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."

Klassifikation & Betroffenheit:

n/a n/a n/apython python *python python 3.11.0fedoraproject fedora 35fedoraproject fedora 36fedoraproject fedora 37

Improper Control of Generation of Code ('Code Injection') 🎯 Medium

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

🛡️ Empfohlene Mitigation: Refactor your program so that you do not have to dynamically generate code.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-35 · Leverage Executable Code in Non-Executab… (Very High) CAPEC-77 · Manipulating User-Controlled Variables (Very High) CAPEC-242 · Code Injection (High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.006 · Obfuscated Files or Information: H… T1027.009 · Obfuscated Files or Information: E… T1564.009 · Hide Artifacts: Resource Forking

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2025-68713 8.0 CVE-2026-37266 8.0 CVE-2023-27753 8.0 CVE-2026-30615 8.0 CVE-2026-31281 8.0

🩹 Patch verfügbar (OSV):

🩹 e1ebdc52b8bd82a928398b0a75149552a723389a (Commit) 🩹 f43e7678a1443b2583fc9bfba091b8ca7e38f075 (Commit)

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2021

Veröffentlicht 08/2022

Heute 08.09.

CVSS-Vektor-Analyse: 6.5

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Erforderlich

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Keine

A · Verfügbarkeit Keine

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Veröffentlicht:23.08.2022

Aktualisiert:17.06.2026 03:46

Assigner (CNA):mitre

EUVD-ID:EUVD-2021-15514

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	2026-08-29	2026-09-06
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

6.5 MEDIUM

🇪🇺 EUVD

EPSS

2.5%

CVE-2021-28861 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

🧪 n/a

CVE-2021-28861 | 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."

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

23.08.2022

🛡️ Details ➔

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