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Mguard Firmware CVE-2015-3966

MEDIUM
Improper Input Validation (CWE-20)
2015-08-30 ics-cert@hq.dhs.gov
Denial Of Service Mguard Firmware Innominate
4.0
CVSS 2.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 4.0 (MEDIUM). Attack characteristics: network attack vector, low complexity. EPSS exploitation probability: 0.28%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAI

The IPsec SA establishment process on Innominate mGuard devices with firmware 8.x before 8.1.7 allows remote authenticated users to cause a denial of service (VPN service restart) by leveraging a. Rated medium severity (CVSS 4.0), this vulnerability is remotely exploitable, 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.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. The IPsec SA establishment process on Innominate mGuard devices with firmware 8.x before 8.1.7 allows remote authenticated users to cause a denial of service (VPN service restart) by leveraging a peer relationship to send a crafted configuration with compression. Affected products include: Innominate Mguard Firmware. Version information: before 8.1.7.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 4.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Confidentiality
None
Integrity
None
Availability
P

DescriptionCVE.org

The IPsec SA establishment process on Innominate mGuard devices with firmware 8.x before 8.1.7 allows remote authenticated users to cause a denial of service (VPN service restart) by leveraging a peer relationship to send a crafted configuration with compression.

Threat Intelligence Overview

EPSS Score
0.3%
Top 49% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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
No
Human Impact· derived
Medium

Priority Score

20
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +20
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:o:innominate:mguard_firmware:8.0.0:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.0.1:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.0.2:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.0.3:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.1.1:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.1.2:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.1.3:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.1.4:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.1.5:*:*:*:*:*:*:*
cpe:2.3:o:innominate:mguard_firmware:8.1.6:*:*:*:*:*:*:*

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CVE-2019-0604 CRITICAL POC
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
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References

Advisories & patches
ADVISORY http://www.innominate.com/data/downloads/software/innominate_security_advisory_20150714_001_en.pdf REF https://ics-cert.us-cert.gov/advisories/ICSA-15-239-03

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