Improper Input Validation in Open-Xchange GmbH OX Dovecot Pro (CVE-2025-59032)
CVE-2025-59032 is a high-severity vulnerability in Open-Xchange GmbH's OX Dovecot Pro affecting the ManageSieve service. The vulnerability causes the ManageSieve AUTHENTICATE command to crash when a literal is used as the SASL initial response, leading to a denial of service by repeatedly crashing the service. No public exploits are known. Red Hat has issued a security advisory with an important update that fixes this issue in affected versions of Dovecot distributed with Red Hat Enterprise Linux 7 Extended Lifecycle Support.
AI Analysis
Technical Summary
The vulnerability CVE-2025-59032 involves improper input validation in the ManageSieve AUTHENTICATE command of OX Dovecot Pro. When a crafted SASL initial response containing a literal is sent, it causes the ManageSieve service to crash, resulting in denial of service. This flaw can be exploited remotely without authentication. Red Hat's advisory RHSA-2026:26564 confirms the issue and provides updated Dovecot packages that fix the vulnerability. The advisory covers Red Hat Enterprise Linux 7 Extended Lifecycle Support versions of Dovecot 2.2.36-8.el7_9.1 and related packages.
Potential Impact
Successful exploitation causes a denial of service by crashing the ManageSieve service repeatedly, making it unavailable to legitimate users. There is no impact on confidentiality or integrity reported. No known public exploits exist at this time.
Mitigation Recommendations
Red Hat has released security updates that fix this vulnerability in Dovecot packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Users should apply these official patches as detailed in Red Hat advisory RHSA-2026:26564. Alternatively, control access to the ManageSieve port or disable the ManageSieve service if it is not needed to mitigate the risk. Patch status is confirmed by the vendor advisory.
Improper Input Validation in Open-Xchange GmbH OX Dovecot Pro (CVE-2025-59032)
Description
CVE-2025-59032 is a high-severity vulnerability in Open-Xchange GmbH's OX Dovecot Pro affecting the ManageSieve service. The vulnerability causes the ManageSieve AUTHENTICATE command to crash when a literal is used as the SASL initial response, leading to a denial of service by repeatedly crashing the service. No public exploits are known. Red Hat has issued a security advisory with an important update that fixes this issue in affected versions of Dovecot distributed with Red Hat Enterprise Linux 7 Extended Lifecycle Support.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2025-59032 involves improper input validation in the ManageSieve AUTHENTICATE command of OX Dovecot Pro. When a crafted SASL initial response containing a literal is sent, it causes the ManageSieve service to crash, resulting in denial of service. This flaw can be exploited remotely without authentication. Red Hat's advisory RHSA-2026:26564 confirms the issue and provides updated Dovecot packages that fix the vulnerability. The advisory covers Red Hat Enterprise Linux 7 Extended Lifecycle Support versions of Dovecot 2.2.36-8.el7_9.1 and related packages.
Potential Impact
Successful exploitation causes a denial of service by crashing the ManageSieve service repeatedly, making it unavailable to legitimate users. There is no impact on confidentiality or integrity reported. No known public exploits exist at this time.
Mitigation Recommendations
Red Hat has released security updates that fix this vulnerability in Dovecot packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Users should apply these official patches as detailed in Red Hat advisory RHSA-2026:26564. Alternatively, control access to the ManageSieve port or disable the ManageSieve service if it is not needed to mitigate the risk. Patch status is confirmed by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:13498
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-27857","CVE-2026-27858"]
- Cvss Version
- null
Threat ID: 6a32cf7e9f87a2db092a948f
Added to database: 06/17/2026, 16:46:54 UTC
Last enriched: 07/15/2026, 16:17:10 UTC
Last updated: 07/31/2026, 19:24:46 UTC
Views: 133
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