CVE-2012-2566
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 · uneditedBloxx Web Filtering before 5.0.14 does not properly interpret X-Forwarded-For headers during access-control and logging operations for HTTPS connection attempts, which allows remote attackers to bypass intended IP address and domain restrictions, and trigger misleading log entries, via a crafted header.
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 · moderate confidenceBloxx Web Filtering before 5.0.14 improperly trusts X-Forwarded-For headers during access-control decisions and logging for HTTPS connections. Attackers can send crafted requests with arbitrary X-Forwarded-For values to spoof their source IP address, bypass IP-based filtering policies, and generate misleading audit logs.
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<= 5.0.13CVSS 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
- None
- Integrity
- Partial
- Availability
- None
AV:N/AC:L/Au:N/C:N/I:P/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Identify Bloxx Web Filtering installation and versionLocate the Bloxx Web Filtering software on your system and retrieve its version number (typically available in the product UI, About section, or via CLI command provided by Bloxx). Compare the version against the affected range: versions 5.0.13 and earlier are vulnerable.Affected if The installed version is 5.0.13 or earlier.
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Confirm HTTPS filtering is enabledCheck the Bloxx Web Filtering configuration to determine if HTTPS (SSL/TLS) inspection or filtering is active. This vulnerability specifically affects HTTPS connections where the X-Forwarded-For header is used.Affected if HTTPS filtering is enabled on the Bloxx device.
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Review X-Forwarded-For header handling configurationAccess the Bloxx administrative interface or configuration files to examine how X-Forwarded-For headers are processed for access-control decisions. Look for settings that determine whether this header is trusted for IP-based policy enforcement.Affected if X-Forwarded-For headers are configured to be trusted for access-control decisions without additional validation.
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Examine audit logs for anomalous X-Forwarded-For patternsSearch the Bloxx audit or access logs for unusual X-Forwarded-For header values, such as unexpected IP addresses, internal IPs appearing externally, or patterns suggesting spoofing (e.g., rapid changes in source IP, non-routable addresses).
A user is affected if Bloxx Web Filtering version 5.0.13 or earlier is installed with HTTPS filtering enabled and X-Forwarded-For headers are trusted for access-control decisions without validation.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataUpgrade to Bloxx Web Filtering version 5.0.14 or later which implements proper X-Forwarded-For header validation. Until upgraded, monitor logs for anomalous X-Forwarded-For patterns and consider complementary network-level IP validation.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2012-2566 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2012-2566 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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