Is CVE-2011-5124 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-5124, but active exploitation has not been confirmed.

Can CVE-2011-5124 be exploited remotely?

Yes. CVE-2011-5124 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-5124?

CVE-2011-5124 has a CVSS score of 10.0 (CRITICAL).

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CRITICALPOC

CVE-2011-5124

CWE-119Published: August 26, 2012· Updated: Jun 16, 2026

10.0

CVSS v3.1

Official Description

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).

NVD Source

Technical Analysis

CVE-2011-5124 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2011-5124. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.