CVE-2024-5539
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 · uneditedThe Access Control Bypass vulnerability found in ALC WebCTRL and Carrier i-Vu in versions up to and including 8.5 allows a malicious actor to bypass intended access restrictions and expose sensitive information via the web based building automation server.
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 confidenceThe Access Control Bypass vulnerability in ALC WebCTRL and Carrier i-Vu building automation systems (versions up to 8.5) allows unauthenticated or authenticated attackers to circumvent intended access restrictions and access sensitive information through the web-based interface.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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 the building automation system productAccess the web interface or system documentation to determine if the installed system is ALC WebCTRL or Carrier i-Vu. Check the login page, system information page, or system header/footer for product identification.Affected if The system is ALC WebCTRL or Carrier i-Vu
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Determine the installed versionLocate the version information in the web-based interface (typically found in About, System Info, or Help sections) or check the installed software package on the host system.Affected if The installed version is 8.5 or any version below 8.5
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Verify web interface accessibilityDetermine if the web interface is accessible from network segments outside the trusted building automation network. Check firewall rules, NAT configurations, or reverse proxy settings that expose the web interface.Affected if The web interface is accessible from untrusted or external network segments without proper access restrictions
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Review access control configurationExamine user accounts, roles, and permission settings within the WebCTRL or i-Vu administration panel to verify that access restrictions are properly enforced for all authenticated and unauthenticated access paths.Affected if Weak or misconfigured access controls exist that allow unauthorized access to sensitive information
If the system is ALC WebCTRL or Carrier i-Vu version 8.5 or below with an accessible web interface, the environment is affected by this access control bypass vulnerability.
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 a version beyond 8.5 that contains the security patch; until then, implement compensating controls such as network segmentation, strict firewall rules limiting access to authorized IPs, and enhanced monitoring of web interface access logs.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-5539 — 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-2024-5539 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
- No weaponised exploit code, or anything meant to cause harm
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