BLU-IC2: Inclusion of Undocumented Features or Chicken Bits
CVE-2025-12176 is a critical-severity inclusion of undocumented features or chicken bits vulnerability in BLU-IC2 from Azure Access Technology, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected BLU-IC2 versions: 1.19.5 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.34% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Blu-ic2 Firmware to 1.20 or a later version.
- Update Blu-ic4 Firmware to 1.20 or a later version.
- Read the advisory on azure-access.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Azure Access Technology | BLU-IC2 | 1.19.5 and earlier | Not stated |
| Azure Access Technology | BLU-IC4 | 1.19.5 and earlier | Not stated |
| Azure-access | Blu-ic2 Firmware | before 1.20 | 1.20 |
| Azure-access | Blu-ic4 Firmware | before 1.20 | 1.20 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 10.0 | Critical | CNA |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
Undocumented administrative accounts were getting created to facilitate access for applications running on board.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Inclusion of Undocumented Features or Chicken Bits
The device includes chicken bits or undocumented features that can create entry points for unauthorized actors.
How developers prevent this class of flaw
- The implementation of chicken bits in a released product is highly discouraged. If implemented at all, ensure that they are disabled in production devices. All interfaces to a device should be documented.
More Inclusion of Undocumented Features or Chicken Bits vulnerabilities (CWE-1242)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in BLU-IC2
- 9.8 Critical severity
- 9.8 Critical severity
Recent Inclusion of Undocumented Features or Chicken Bits vulnerabilities
- 7.5 High severity
- 7.2 High severity
- 7.5 High severity
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