What is CVE-2017-6339?

CVE-2017-6339 is a medium-severity vulnerability in Trendmicro Interscan Web Security Virtual Appliance, classified under Improper Privilege Management. CVSS score: 6.5/10. Published 2017-04-05.

How severe is CVE-2017-6339?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Privilege escalation in Trendmicro Interscan Web Security Virtual Appliance

CVE-2017-6339

Trend Micro InterScan Web Security Virtual Appliance (IWSVA) 6.5 before CP 1746 mismanages certain key and certificate data. Per IWSVA documentation, by default, IWSVA acts as a private Certificate Authority (CA) and dynamically generates digital certificates that are sent to client browsers to complete a secure passage for HTTPS connections. It also allows administrators to upload their own certificates signed by a root CA. An attacker with low privileges can download the current CA certificate and Private Key (either the default ones or ones uploaded by administrators) and use those to decrypt HTTPS traffic, thus compromising confidentiality. Also, the default Private Key on this appliance is encrypted with a very weak passphrase. If an appliance uses the default Certificate and Private Key provided by Trend Micro, an attacker can simply download these and decrypt the Private Key using the default/weak passphrase.

Vulnerability class: Privilege Escalation

Published 2017-04-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.041 (90.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000

Affected products

Trendmicro Interscan Web Security Virtual Appliance

Weakness classification (CWE)

References

success.trendmicro.com/solution/1116960 (Patch, Vendor Advisory)
www.securityfocus.com/bid/97492 (VDB Entry, Third Party Advisory, vdb-entry)
www.qualys.com/2017/01/12/qsa-2017-01-12/qsa-2017-01-12.pdf (Technical Description, Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2017-6339?: CVE-2017-6339 is a medium-severity vulnerability in Trendmicro Interscan Web Security Virtual Appliance, classified under Improper Privilege Management. CVSS score: 6.5/10. Published 2017-04-05.
How severe is CVE-2017-6339?: Medium severity. CVSS v3 base score is 6.5 out of 10.