How severe is CVE-2017-11391?

CVE-2017-11391 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 62% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11391?

CVE-2017-11391 primarily affects Trendmicro Interscan Messaging Security Virtual Appliance. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-11391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-11391 published?

CVE-2017-11391 was published on 2017-08-03 and last updated on 2026-06-17.

CVE-2017-11391

CVE-2017-11391 is a high-severity vulnerability in Trendmicro Interscan Messaging Security Virtual Appliance with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 62% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 62% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Trendmicro Interscan Messaging Security Virtual Appliance
Published: 2017-08-03
Last modified: 2026-06-17

Description

Proxy command injection vulnerability in Trend Micro InterScan Messaging Virtual Appliance 9.0 and 9.1 allows remote attackers to execute arbitrary code on vulnerable installations. The specific flaw can be exploited by parsing the "t" parameter within modTMCSS Proxy. Formerly ZDI-CAN-4744.

Frequently asked questions

What is CVE-2017-11391?: Proxy command injection vulnerability in Trend Micro InterScan Messaging Virtual Appliance 9.0 and 9.1 allows remote attackers to execute arbitrary code on vulnerable installations. The specific flaw can be exploited by parsing the "t" parameter within modTMCSS Proxy. Formerly ZDI-CAN-4744.
How severe is CVE-2017-11391?: CVE-2017-11391 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 62% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11391?: CVE-2017-11391 primarily affects Trendmicro Interscan Messaging Security Virtual Appliance. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-11391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-11391 published?: CVE-2017-11391 was published on 2017-08-03 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:trendmicro:interscan_messaging_security_virtual_appliance:9.0:*:*:*:*:*:*:*
cpe:2.3:a:trendmicro:interscan_messaging_security_virtual_appliance:9.1:*:*:*:*:*:*:*

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