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Vulnerability record · CVE-2009-1211 · published 1 April 2009

CVE-2009-1211: Bluecoat proxysg va-10 vulnerability

Bluecoat · Proxysg Va 10

Blue Coat ProxySG, when transparent interception mode is enabled, uses the HTTP Host header to determine the remote endpoint, which allows remote attackers to bypass access controls for Flash, Java, Silverlight, and probably other technologies, and possibly communicate with restricted intranet sites, via a crafted web page that causes a client to send HTTP requests with a modified Host header.

5.8 CVSS 2.0 Medium EPSS 1.4% · top 29.4% CWE-16 · CWE-16
5.8CVSS 2.0 base score
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
19Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

Blue Coat ProxySG, when transparent interception mode is enabled, uses the HTTP Host header to determine the remote endpoint, which allows remote attackers to bypass access controls for Flash, Java, Silverlight, and probably other technologies, and possibly communicate with restricted intranet sites, via a crafted web page that causes a client to send HTTP requests with a modified Host header.

AV:N/AC:M/Au:N/C:N/I:P/A:P

Affected products

19 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securitytracker.com/id?1021781
https://hypersonic.bluecoat.com/support/securityadvisories/ProxySG_in_transparent_deployments Vendor Advisory
http://www.securitytracker.com/id?1021781
https://hypersonic.bluecoat.com/support/securityadvisories/ProxySG_in_transparent_deployments Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2011-5124Blue Coat ProxySG BCAAA stack buffer overflow via sync portThe BCAAA component used by Blue Coat ProxySG 4.2.3 through 6.1 and ProxyOne contains a stack-based buffer overflow that is triggered by a large pack…EPSS 55%analysed9.3CVE-2010-5189Bluecoat sgos permissions and access controls vulnerabilityBlue Coat ProxySG before SGOS 4.3.4.1, 5.x before SGOS 5.4.5.1, 5.5 before SGOS 5.5.4.1, and 6.x before SGOS 6.1.1.1 allows remote authenticated user…EPSS 1.8%7.5CVE-2016-6594Bluecoat advanced secure gateway vulnerabilityBlue Coat Advanced Secure Gateway 6.6, CacheFlow 3.4, ProxySG 6.5 and 6.6 allows remote attackers to bypass blocked requests, user authentication, an…EPSS 1.3%7.5CVE-2004-0079Cisco firewall services module null pointer dereference vulnerabilityThe do_change_cipher_spec function in OpenSSL 0.9.6c to 0.9.6k, and 0.9.7a to 0.9.7c, allows remote attackers to cause a denial of service (crash) vi…EPSS 9.5%7.4CVE-2015-8597Bluecoat proxysg vulnerabilityOpen redirect vulnerability in Blue Coat ProxySG 6.5 before 6.5.8.8 and 6.6 and Advanced Secure Gateway (ASG) 6.6 might allow remote attackers to red…EPSS 1.9%7.1CVE-2013-5959Bluecoat proxysgos memory buffer overflow vulnerabilityBlue Coat ProxySG before 6.2.14.1, 6.3.x, 6.4.x, and 6.5 before 6.5.2 allows remote attackers to cause a denial of service (memory consumption and dr…EPSS 1.5%5.0CVE-2010-5190Bluecoat sgos permissions and access controls vulnerabilityThe Active Content Transformation functionality in Blue Coat ProxySG before SGOS 4.3.4.2, 5.x before SGOS 5.4.5.1, 5.5 before SGOS 5.5.4.1, and 6.x b…EPSS 1.4%5.0CVE-2004-0081Cisco firewall services module vulnerabilityOpenSSL 0.9.6 before 0.9.6d does not properly handle unknown message types, which allows remote attackers to cause a denial of service (infinite loop…EPSS 7.2%

Source: NIST National Vulnerability Database (record CVE-2009-1211), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.