A HIGH-severity vulnerability identified as CVE-2025-59032 has been published on March 27, 2026 with a CVSS base score of 7.5. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.
Vulnerability Details
CVE ID: CVE-2025-59032
Severity: HIGH
CVSS Score: 7.5
Published: March 27, 2026
Weakness (CWE): CWE-20
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | High |
Technical Description
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.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to cause a denial of service. Organizations running affected software should treat this as a priority remediation item.
Recommended Action
No official patch is available yet. Until one is released:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2026-26063 — CVSS 8.8 — HIGH / CVSS 8.8
- [HIGH] CVE-2026-4850 — CVSS 7.3 (March 26, 2026) — HIGH / CVSS 7.3
- [HIGH] CVE-2026-3608 — CVSS 7.5 (March 25, 2026) — HIGH / CVSS 7.5
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