CVE-2025-59032
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
A vulnerability in ManageSieve causes the service to crash when processing the AUTHENTICATE command with a literal as the SASL initial response. This can be exploited to repeatedly crash the service, making it unavailable for other users.
Risk Assessment
The risk is a potential Denial of Service (DoS) attack on the ManageSieve service, which could prevent all users from managing email filtering rules.
Recommendation
It is recommended to restrict access to the ManageSieve port or disable the service if not needed. Alternatively, upgrade to a patched version.
Other vulnerabilities in ManageSieve
See all- CVE-2026-40016Medium
Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.
- CVE-2026-27858High
A vulnerability in managesieve allows an attacker to send a specially crafted message before authentication, causing excessive memory allocation. This can crash the managesieve-login process and make the protocol unavailable.
Original NVD description (English source)
ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS