# CVE-2025-57278: CVE-2025-57278

Status: published. Published: 2025-09-09. Updated: 2026-11-07.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- lb-link / bl-cpe300m_firmware: - (affected, custom). Source: NVD; conditional on NVD configuration criteria

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "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"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable yes; technical impact partial; source NVD SSVC: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- Weaknesses: CWE-287

## Exploit evidence

- exploit: https://www.zyenra.com/blog/improper-ip-bound-session-authentication-in-lb-link-cpe300m (cve@mitre.org)

## References

- https://www.lb-link.com/CPE300M-AX300-4G-LTE-Router-pd502775568.html (cve@mitre.org; Product)

- https://www.zyenra.com/blog/improper-ip-bound-session-authentication-in-lb-link-cpe300m (cve@mitre.org; Exploit, Third Party Advisory)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-57278; retrieved 2026-11-07; source updated 2026-11-07

Revision: 0246c7d242b458f1365446e77f72a5aac68dc79aa128a1b20787956df322fdd2

Canonical: https://y2.dev/cve/CVE-2025-57278

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