CVE-2025-57278

publishedCWE-287

The LB-Link BL-CPE300M AX300 4G LTE Router firmware version BL-R8800_B10_ALK_SL_V01.01.02P42U14_06 does not implement proper session handling. After a user authenticates from a specific IP address, the router grants access to any other client using that same IP, without requiring credentials or verifying client identity. There are no session tokens, cookies, or unique identifiers in place. This flaw allows an attacker to obtain full administrative access simply by configuring their device to use the same IP address as a previously authenticated user. This results in a complete authentication bypass.

Technical severity8.8 highCVSS 3.1 · NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Published2025-09-09Source updated 2026-11-07

Collected2026-11-071 attributed source

Fixes and workarounds

No remediation reported in collected sources.

Missing remediation information is not evidence that no patch exists.

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
bl-cpe300m_firmware lb-link	- (affected, custom) Configuration dependent This product alone does not establish exposure; review the source applicability configuration.	NVD

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:lb-link:bl-cpe300m_firmware:-:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:lb-link:bl-cpe300m:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 8.8 high	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`	NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Exploit evidence

https://www.zyenra.com/blog/improper-ip-bound-session-authentication-in-lb-link-cpe300m
exploit · [email protected]

References

https://www.lb-link.com/CPE300M-AX300-4G-LTE-Router-pd502775568.html[email protected] · Product
https://www.zyenra.com/blog/improper-ip-bound-session-authentication-in-lb-link-cpe300m[email protected] · Exploit, Third Party Advisory

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