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ProxyoneApplication · Bluecoat

CVE-2011-5124

HIGH · 10.0 CVSS v2.0 Published 2012-08-26
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
High EPSS Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Stack-based buffer overflow in the BCAAA component before build 60258, as used by Blue Coat ProxySG 4.2.3 through 6.1 and ProxyOne, allows remote attackers to execute arbitrary code via a large packet to the synchronization port (16102/tcp).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A stack-based buffer overflow exists in the BCAAA (Blue Coat Authentication and Authorization) component before build 60258. The vulnerability affects Blue Coat ProxySG versions 4.2.3 through 6.1 and ProxyOne appliances. Remote attackers can achieve arbitrary code execution by sending a specially crafted large packet to the synchronization port at 16102/tcp.

MitigationUpgrade the BCAAA component to build 60258 or later. If immediate patching is not possible, consider blocking or restricting access to port 16102/tcp from untrusted networks to reduce the attack surface.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
ProxyoneApplication
Affected:all versions
ProxysgApplication
Affected:= 4.2.6= 4.3.2.3= 5.1= 5.1.6.1= 5.2= 5.2.2.4= 5.2.5.2= 5.3= 5.3.2.1= 5.4= 5.4.1.1= 6

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify if Blue Coat ProxySG or ProxyOne is installed
    Check system inventory, installed software, or running services for Blue Coat products. Look for ProxySG, ProxyOne, or BCAAA processes.
    Affected if Blue Coat ProxySG or ProxyOne is installed and running
  2. Determine the BCAAA build version
    Access the ProxySG management console or CLI and check the BCAAA component build number. Typically found in the about or system information section.
    Affected if BCAAA build version exists and is below 60258
  3. Confirm the ProxySG version
    Check the ProxySG version through the management interface or CLI using 'show version' or similar command.
    Affected if ProxySG version is 4.2.6, 4.3.2.3, 5.1, 5.1.6.1, 5.2, 5.2.2.4, 5.2.5.2, 5.3, 5.3.2.1, 5.4, 5.4.1.1, or 6.x (any minor version)
  4. Verify if port 16102 is listening
    Check if the synchronization port 16102/tcp is open and listening on the appliance. Use netstat, nmap, or the ProxySG management interface.
    Affected if Port 16102/tcp is open and accessible from network segments that include untrusted hosts

The environment is affected if BCAAA build is below 60258 on a vulnerable ProxySG version (4.2.6 through 6.x) with port 16102/tcp exposed to the attacker.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade the BCAAA component to build 60258 or later. If immediate patching is not possible, consider blocking or restricting access to port 16102/tcp from untrusted networks to reduce the attack surface.

Recommended fix High confidence

Blue Coat ProxySG 6.2.5.1 (or later) which includes BCAAA build 60258

  1. 1. Identify the current Blue Coat ProxySG or ProxyOne version and build number
  2. 2. Access the Blue Coat support portal (kb.bluecoat.com) to obtain the upgrade package for ProxySG 6.2.5.1 or later which includes BCAAA build 60258
  3. 3. Review the upgrade guide for your specific ProxySG model
  4. 4. Schedule a maintenance window as upgrades may require service interruption
  5. 5. Backup the current configuration before proceeding
  6. 6. Upgrade the ProxySG device to version 6.2.5.1 or later to obtain BCAAA build 60258 which contains the vulnerability fix
  7. 7. Verify the BCAAA component build number is 60258 or higher after upgrade
  8. 8. Test the synchronization port (16102/tcp) functionality to ensure proper operation
Caveat Upgrade may require downtime and configuration backup is strongly recommended before proceeding

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Proxyone Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA3.0 h
15.0 hours of engineering $2,560
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-5124 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data