SEPPmail Secure Email Gateway up to 15.0.0 Email Address interpretation conflict

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in SEPPmail Secure Email Gateway up to 15.0.0. Affected by this vulnerability is an unknown functionality of the component Email Address Handler. Executing a manipulation can lead to interpretation conflict. This vulnerability is registered as CVE-2026-27444. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in SEPPmail Secure Email Gateway up to 15.0.0 and classified as critical. This vulnerability affects some unknown functionality of the component Email Address Handler. The manipulation with an unknown input leads to a interpretation conflict vulnerability. The CWE definition for the vulnerability is CWE-436. Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was published by Andris Suter-Dörig. The advisory is shared for download at downloads.seppmail.com. This vulnerability was named CVE-2026-27444 since 02/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 15.0.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-9380). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Interpretation conflict
CWE: CWE-436
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Secure Email Gateway 15.0.1

Timelineinfo

02/19/2026 CVE reserved
03/04/2026 +13 days Advisory disclosed
03/04/2026 +0 days VulDB entry created
03/05/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: downloads.seppmail.com
Researcher: Andris Suter-Dörig
Status: Confirmed

CVE: CVE-2026-27444 (🔒)
GCVE (CVE): GCVE-0-2026-27444
GCVE (VulDB): GCVE-100-348700
EUVD: 🔒

Entryinfo

Created: 03/04/2026 11:18
Updated: 03/05/2026 16:57
Changes: 03/04/2026 11:18 (67), 03/04/2026 14:18 (1), 03/05/2026 16:57 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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