Platform
linux
Component
ox-dovecot-pro-managesieve
Fixed in
2.4.1
3.1.1
CVE-2025-59032 describes a denial-of-service (DoS) vulnerability within OX Dovecot Pro ManageSieve. This flaw allows an attacker to repeatedly crash the ManageSieve service by exploiting the AUTHENTICATE command with a malicious literal as the initial SASL response. This disruption renders the service unavailable to legitimate users. The vulnerability impacts versions 0.0 through 3.1.0, and mitigation involves access control, disabling the service, or upgrading to a patched version.
The primary impact of CVE-2025-59032 is a denial-of-service condition. A successful exploit allows an attacker to crash the ManageSieve service, preventing legitimate users from accessing email management features provided by ManageSieve. Repeated exploitation can lead to prolonged service outages, impacting productivity and potentially disrupting critical email workflows. While no public exploits are currently known, the ease of crafting a malicious AUTHENTICATE command suggests a relatively low barrier to entry for attackers. The blast radius is limited to users relying on ManageSieve for email management; however, the disruption can be significant for those users.
CVE-2025-59032 is not currently listed on the CISA KEV catalog. The EPSS score is likely to be low given the absence of public exploits and the relatively straightforward mitigation options. While no active campaigns are known, the simplicity of the exploit suggests that it could be incorporated into automated scanning tools or targeted attacks. The vulnerability was publicly disclosed on 2026-03-27.
Exploit Status
EPSS
0.07% (21% percentile)
CISA SSVC
CVSS Vector
The recommended mitigation for CVE-2025-59032 is to upgrade to a patched version of OX Dovecot Pro ManageSieve as soon as it becomes available. If an immediate upgrade is not feasible, implement temporary workarounds. Restricting access to the ManageSieve port (typically 993) using firewalls or access control lists can prevent unauthorized connections. Disabling the ManageSieve service entirely is another option if it's not essential for your environment. Monitor ManageSieve logs for suspicious AUTHENTICATE command patterns. After upgrading, confirm the fix by attempting to send a crafted AUTHENTICATE command and verifying that the service does not crash.
Control access to the ManageSieve port or disable the service if not needed. Alternatively, upgrade to a fixed version of the software.
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CVE-2025-59032 is a denial-of-service vulnerability in OX Dovecot Pro ManageSieve versions 0.0-3.1.0. An attacker can crash the ManageSieve service by sending malicious AUTHENTICATE commands.
You are affected if you are using OX Dovecot Pro ManageSieve versions 0.0 through 3.1.0 and have not upgraded to a patched version.
Upgrade to a patched version of OX Dovecot Pro ManageSieve. As a temporary workaround, restrict access to the ManageSieve port or disable the service.
No publicly available exploits are known at this time, but the vulnerability's simplicity suggests a potential for exploitation.
Refer to the official OX documentation and security advisories for updates on this vulnerability and available patches.
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