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CVE-2025-1609

LB-LINK AC1900 Router set_cmd websGetVar os command injection

Published: Feb 24, 2025Updated: Nov 4, 2025 Sources: CVE List NVD BDUCWE-77
6.3MEDIUM
NVD MITRE
EPSS Score
10.1%
Top 4.9%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available
Self-Check
Not available

Description

A vulnerability has been found in LB-LINK AC1900 Router 1.0.2 and classified as critical. Affected by this vulnerability is the function websGetVar of the file /goform/set_cmd. The manipulation of the argument cmd leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

In plain language

AI Worth attention

CVE-2025-1609 is a flaw in certain LB-LINK AC1900 router firmware that lets an attacker remotely run commands on the router; if your small business uses a LB-LINK BL-AC1900/AC1900 Router running version 1.0.2, you should treat this as a real risk and take action.

Executive summary

CVE-2025-1609 is a remote operating system command injection in the LB-LINK AC1900 Router (web handler /goform/set_cmd via websGetVar), where manipulating the `cmd` argument can lead to arbitrary command execution; public exploits exist.

If affected, business impact
Router takeoverInterception of internet trafficDevice disruption or outagesPossible malware persistence

What to do now

  1. Check whether you use a LB-LINK AC1900 Router / LB-LINK BL-AC1900 (AC1900 Router) and confirm the firmware version is 1.0.2.
  2. If version 1.0.2 is in use, restrict access to the router’s web management interface from the internet (allow only trusted internal IPs, or disable WAN/remote management).
  3. Place the router behind a firewall and block inbound traffic to the router’s management/web ports from the internet.
  4. Deploy network monitoring or protections (IDS/IPS) to detect and prevent suspicious attempts targeting /goform/set_cmd or unusual web requests.
  5. Contact your router vendor or your IT support to obtain the fixed firmware/build for LB-LINK AC1900 Router (AC1900 Router / LB-LINK BL-AC1900); do not rely on the absence of alerts—this issue has a public exploit.
Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-77CWE-78

Affected Products

LB-LINK
commercial
ac1900 firmwareEmbedded
Networking Infrastructure / router-switch
AC1900 RouterEmbedded
Networking Infrastructure / router-switch
Shenzhen Bilian Electronics Co., Ltd.
commercial·CN
LB-LINK BL-AC1900On-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Is your org exposed to CVE-2025-1609?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://noisy-caravel-a9a.notion.site/LBLINK_AC1900_V1-0-2_-set_cmd-_-bs_SetCmd-_CI-179898c94eac808e8875e0b8e1bee47e?pvs=74
noisy-caravel-a9a.notion.site
https://vuldb.com/?ctiid.296599
vuldb.com
https://vuldb.com/?id.296599
vuldb.com
and 1 more references View all →

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