Auth bypass in Lb-Link Bl-Cpe300m

CVE-2025-57278

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.

Vulnerability class: Broken Authentication

EPSS: 0.004 (33.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-57278?
CVE-2025-57278 is a high-severity vulnerability in Lb-Link Bl-Cpe300m, classified under Improper Authentication. CVSS score: 8.8/10. Published 2025-09-09.
How severe is CVE-2025-57278?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-57278 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.