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Secure Email Gateway CVE-2024-6744

CRITICAL
Stack-based Buffer Overflow (CWE-121)
2024-07-15 twcert@cert.org.tw
9.8
CVSS 3.1 · Vendor: cert
View

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Stack buffer bounds checking
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 0.8% exploitation probability (EPSS)

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AnalysisAI

The SMTP Listener of Secure Email Gateway from Cellopoint does not properly validate user input, leading to a Buffer Overflow vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-121. The SMTP Listener of Secure Email Gateway from Cellopoint does not properly validate user input, leading to a Buffer Overflow vulnerability. An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary system commands on the remote server. Affected products include: Cellopoint Secure Email Gateway.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (cert) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (cert) · only source for this CVE.

CVSS VectorVendor: cert

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

The SMTP Listener of Secure Email Gateway from Cellopoint does not properly validate user input, leading to a Buffer Overflow vulnerability. An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary system commands on the remote server.

Threat Intelligence Overview

EPSS Score
0.8%
Top 49% exploitable
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.8%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.

Affected Products (CPE)CVE.org

cpe:2.3:a:cellopoint:secure_email_gateway:*:*:*:*:*:*:*:*
CVE-2024-9043 CRITICAL
9.8 Sep 20

Secure Email Gateway from Cellopoint has Buffer Overflow Vulnerability in authentication process. Rated critical severit

CVE-2024-20401 CRITICAL
9.8 Jul 17

A vulnerability in the content scanning and message filtering features of Cisco Secure Email Gateway could allow an unau

CVE-2026-44128 CRITICAL
9.3 May 08

Remote code execution in SEPPmail Secure Email Gateway versions prior to 15.0.2.1 enables unauthenticated attackers to e

CVE-2026-44125 CRITICAL
9.3 May 08

Authorization bypass in SEPPmail Secure Email Gateway versions prior to 15.0.4 enables remote unauthenticated attackers

CVE-2026-44127 HIGH
8.8 May 08

Remote unauthenticated attackers can read arbitrary local files and trigger deletion of targeted files in SEPPmail Secur

CVE-2026-84830 HIGH
8.6 Sep 03

Command injection in SEPPmail Secure Email Gateway before version 15.0.7 enables authenticated administrators to execute

CVE-2026-44129 HIGH
8.3 May 08

Remote code execution in SEPPmail Secure Email Gateway versions before 15.0.4 allows unauthenticated attackers to execut

CVE-2026-29144 HIGH
7.8 Apr 02

SEPPmail Secure Email Gateway before version 15.0.3 allows attackers to bypass subject sanitization and forge security t

CVE-2026-29143 HIGH
7.8 Apr 02

SEPPmail Secure Email Gateway before version 15.0.3 fails to properly authenticate inner messages within S/MIME-encrypte

CVE-2026-29139 HIGH
7.8 Apr 02

Account takeover in SEPPmail Secure Email Gateway versions before 15.0.3 allows unauthenticated attackers to reset victi

CVE-2026-29141 HIGH
7.7 Apr 02

SEPPmail Secure Email Gateway before version 15.0.3 allows remote attackers to bypass subject line sanitization controls

CVE-2026-29140 HIGH
7.7 Apr 02

SEPPmail Secure Email Gateway before version 15.0.3 allows remote attackers to inject malicious certificates into S/MIME

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