Is CVE-2026-27444 in the CISA KEV catalog?

No. CVE-2026-27444 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-27444?

CVE-2026-27444 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-27444?

CVE-2026-27444 has an EPSS score of 0.21% (12th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27444?

Upgrade seppmail to 15.0.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-27444

HIGH

7.5

CVSS v3

NVD

Description

SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.

CWE-436

How to fix

Remediation Available

seppmailNVD

Affected:< 15.0.1Fixed in:15.0.1CVE-2026-27444derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.21%probability of exploitation in 30 days

12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Vendor Advisory1

downloads.seppmail.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-05.