CVE-2018-6789 — CVE & Security Advisory Radar

🎯 CVE-2018-6789 🔓 Exploited 🧪 PoC 🇪🇺 EUVD

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CVE-2018-6789 | An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

Klassifikation & Betroffenheit:

n/a n/a n/aexim exim *debian debian_linux 7.0debian debian_linux 8.0debian debian_linux 9.0canonical ubuntu_linux 14.04canonical ubuntu_linux 16.04canonical ubuntu_linux 17.10

Improper Restriction of Operations within the Bounds of a Memory Buffer 🎯 High

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

🛡️ Empfohlene Mitigation: Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow prot…

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-10 · Buffer Overflow via Environment Variable… (High) CAPEC-14 · Client-side Injection-induced Buffer Ove… (High) CAPEC-24 · Filter Failure through Buffer Overflow (High) CAPEC-42 · MIME Conversion (High) CAPEC-44 · Overflow Binary Resource File (Very High) CAPEC-45 · Buffer Overflow via Symbolic Links (High) CAPEC-100 · Overflow Buffers (Very High) CAPEC-123 · Buffer Manipulation (Very High)

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

CVE-2026-37541 10.0 CVE-2026-36767 10.0 CVE-2025-54328 10.0 CVE-2026-30302 10.0 CVE-2025-69770 10.0

🧪 Exploit-Evidenz: EDB-45671 · exim 4.90 - Remote Code Execution EDB-44571 · Exim < 4.90.1 - 'base64d' Remote Code Execution

🐙 c0llision/exim-vuln-poc 🐙 beraphin/CVE-2018-6789 🐙 synacktiv/Exim-CVE-2018-6789 🐙 martinclauss/exim-rce-cve-2018-6 🐙 thistehneisen/CVE-2018-6789-Pyth

🩹 Patch verfügbar (OSV):

🩹 062990cc1b2f9e5d82a413b53c8f0569075de700 (Commit)

📚 Referenzen & Quellen:

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

Ausnutzungs-Zeitleiste:

Reserviert 2018

Veröffentlicht 02/2018

Im KEV seit 11/2021

Heute 18.09.

CVSS-Vektor-Analyse: 9.8

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Hoch

A · Verfügbarkeit Hoch

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

Veröffentlicht:08.02.2018

Aktualisiert:17.06.2026 02:02

Assigner (CNA):mitre

EUVD-ID:EUVD-2018-18536

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

CWE-119: Memory Corruption ✓ 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

9.8 CRITICAL

🇪🇺 EUVD

EPSS

81.7%

CVE-2018-6789 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

🔓 🧪 n/a

CVE-2018-6789 | An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

CWE-119: Memory Corruption ✓ Offizieller Patch / Advisory verfügbar

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

08.02.2018

🛡️ Details ➔

CVE-2018-6789 | An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.

Zero-Day & Vulnerability Intelligence Hub

CVE-2018-6789 | An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.