Is CVE-2016-6594 being actively exploited?

CVE-2016-6594 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2016-6594?

CVE-2016-6594 has a CVSS 3.0 base score of 7.5 (HIGH).

CVE-2016-6594

HIGH · CVSS 7.5EPSS 1.3%EU EUVD

Blue Coat Advanced Secure Gateway 6.6, CacheFlow 3.4, ProxySG 6.5 and 6.6 allows remote attackers to bypass blocked requests, user authentication, and payload scanning.

Key facts

CVSS score: 7.5 (v3.0)
Severity: HIGH
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-254
EPSS score: 1.3% (70th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2016-7512)
Published: June 8, 2017
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2016-7512 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

bluecoat / advanced secure gateway
bluecoat / cacheflow
bluecoat / proxysg
bluecoat / proxysg

Certified products that may be affected

7 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Blue Coat ProxySG S400 and S500 running SGOS v6.5 - Blue Coat Systems, Inc. - Common Criteria CSEC2014004 - archived
ProxySG S400-20 [1], S400-30 [2] and S400-40 [3] - Blue Coat® Systems, Inc. - FIPS 140 2256 - historical
ProxySG S500-10 [1] and S500-20 [2] - Blue Coat® Systems, Inc. - FIPS 140 2257 - historical
Blue Coat ProxySG SG600, SG900, SG9000 running SGOS v6.5 - Blue Coat Systems, Inc. - Common Criteria 383-4-268 - archived
ProxySG SG900-10B [1], SG900-20 [2], SG900-30 [3], SG900-45 [4] and SG900-55 [5] - Blue Coat® Systems, Inc. - FIPS 140 2195 - historical

See all 7 in the Security Certifications Explorer.

References

http://www.securityfocus.com/bid/91404
https://bto.bluecoat.com/security-advisory/sa130(Mitigation, Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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