[UPDATE] [medium] Dovecot: Multiple vulnerabilities enable Denial of Service

medium

A remote, anonymous attacker can exploit multiple vulnerabilities in Dovecot to perform a Denial of Service attack.

CSIRTS triage

What: Multiple vulnerabilities in Dovecot enable denial of service attacks.
Who is affected: Deployments of Dovecot mail server software.
Urgency: Moderate urgency; denial of service attacks can disrupt mail services but do not enable data access or code execution.
Action: Apply Dovecot updates that address the disclosed denial of service vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-0235

Recent advisories for Dovecot

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Dovecot: Multiple vulnerabilitiescert-bund · 2026-08-31
mediumCVE-2026-42008: Forwarding information received from a host listed as a trusted proxy is not kept separate fro…nvd · 2026-08-28
mediumCVE-2026-33604: An attacker that can get Dovecot to relay a message, for example through Sieve redirect or sub…nvd · 2026-08-28
medium[UPDATE] [medium] OX Dovecot Pro: Multiple Vulnerabilitiescert-bund · 2026-08-11
medium[UPDATE] [medium] Dovecot: Multiple vulnerabilitiescert-bund · 2026-08-11

[UPDATE] [medium] Dovecot: Multiple vulnerabilities enable Denial of Service

CSIRTS triage

Details

Recent advisories for Dovecot

More from CERT-Bund (BSI) Security Advisories