---
cve: "CVE-2017-2669"
severity: "LOW"
cvss: 3.7
epss: "4.5%"
vendor: "[UNKNOWN]"
kev: false
exploited: false
published: "2018-06-21 13:29:00"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T01:58:09+02:00"
---

# CVE-2017-2669

> 3.7 LOW · 🧪 PoC

## Beschreibung

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

## CVSS-Vektor

```
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 000030feb7a30f193197f1aab8a7b04a26b42735 (Commit)

## Referenzen

- <https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html>
- <http://www.openwall.com/lists/oss-security/2017/04/11/1>
- <https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669>
- <https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch>
- <https://www.debian.org/security/2017/dsa-3828>
- <http://www.securityfocus.com/bid/97536>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2017-2669) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_