CVE-2020-17518 — CVE & Security Advisory Radar

🎯 CVE-2020-17518 🇪🇺 EUVD

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CVE-2020-17518 | Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.

Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.

Klassifikation & Betroffenheit:

Apache Software Foundation Apache Flink Apache Flink 1.5.1 to 1.11.2

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-2026-71378 4.6 CVE-2025-54941 4.6 CVE-2025-62503 4.6 CVE-2024-45477 4.6 CVE-2024-37389 4.6

🧪 Exploit-Evidenz:

🐙 QmF0c3UK/CVE-2020-17518 🐙 murataydemir/CVE-2020-17518 🐙 rakjong/Flink-CVE-2020-17518-get

🩹 Patch verfügbar (OSV):

🩹 e8cfe6701b9768d1f1fe4488640cba5f9b42d73f (Commit)

📚 Referenzen & Quellen:

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

Ausnutzungs-Zeitleiste:

Reserviert 2020

Veröffentlicht 01/2021

Heute 17.09.

CVSS-Vektor-Analyse: 3.1

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Keine

I · Integrität Hoch

A · Verfügbarkeit Keine

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

Veröffentlicht:05.01.2021

Aktualisiert:13.02.2025 16:27

Assigner (CNA):apache

EUVD-ID:EUVD-2022-0892

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

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

Tier	2026-08-29	2026-09-17
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

3.1 LOW

🇪🇺 EUVD

EPSS

50%

CVE-2020-17518 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

Apache Software Foundation

CVE-2020-17518 | Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.

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

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

05.01.2021

🛡️ Details ➔

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