CVE-2011-5124

CVE-2011-5124 is a critical-severity vulnerability in Bluecoat Proxyone with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 55% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

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).

Frequently asked questions

What is CVE-2011-5124?
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).
How severe is CVE-2011-5124?
CVE-2011-5124 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2011-5124 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 55% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-5124?
CVE-2011-5124 primarily affects Bluecoat Proxyone. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-5124?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-5124 published?
CVE-2011-5124 was published on 2012-08-26 and last updated on 2026-06-16.

References

Affected products (13)

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

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