CVE-2026-278587.5HighCWE-400

CVE-2026-27858: Open-Xchange GmbH OX Dovecot Pro vulnerability

Open-Xchange GmbH · OX Dovecot Pro

Vendor fix available · Affected: Open-Xchange GmbH OX Dovecot Pro · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.8%probability of exploitation in the next 30 days

57th percentile

050100

Higher than 57% of scored CVEs

7.5HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Open-Xchange GmbH · OX Dovecot Proup to and including 2.3.0; up to and including 3.1.0; up to and including 2.4.0

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Uncontrolled Resource Consumption · Denial of Service
Vendor: Open-Xchange GmbH
Published: March 2026
Band: Unlikely (under 1%), March 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-27858 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

6 more references are in the CVE record.