CVE-2011-5124
CriticalPublic exploitStack-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).
Published Aug 26, 2012 · Updated Apr 28, 2026
Key Facts
Patch immediately- CVE-2011-5124 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Proxyone (Bluecoat), Proxysg (Bluecoat).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 55% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
10.0
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
55%
Higher than 99.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
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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).
Affected Products
13 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ProxyoneBluecoat | See advisory | n/a |
| ProxysgBluecoat | 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 | n/a |
Timeline
Publicly disclosed
Aug 26, 2012
Last updated
Apr 28, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
FAQ
Common Questions.
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).
Affected: Proxyone (Bluecoat); Proxysg (Bluecoat) versions 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. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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