CVE-2026-27858
HIGH EPSS 36.3%
Published Mar 27, 20263mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
Published Mar 27, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
Description
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
36.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| dovecot | dovecot | * | <2.4.3 |
| open-xchange | dovecot | * | <2.3.22.1 |
| open-xchange | dovecot | * | ≥3.0.0 – <3.0.5 |
| open-xchange | dovecot | * | ≥3.1.0 – <3.1.4 |
References 1
- documentation.open-xchange.com https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.