SEPTEMBER 18, 2026
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Case File

CVE-2026-33605

HIGH · CVSS 7.5 EPSS 0.38% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

An unauthenticated attacker can exploit a vulnerability in the ManageSieve login process by sending a malformed command, leading to a denial of service. In high-security mode, only the attacker's connection is affected, but in high-performance mode, all connections handled by the same process are terminated, potentially impacting Sieve script management. Organizations using ManageSieve, especially in high-performance environments, should prioritize updating to a non-vulnerable version and restrict network access to trusted clients.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-33605
Severity
HIGH
CVSS
7.5
EPSS
0.38%

Original NVD Description

An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating. If running in high-security mode (default for community releases), only the attacker's own connection is terminated. If running in high-performance mode (default for Pro releases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause denial of service for Sieve script management. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.