TI-2025-04481 Aliases CVE-2025-4999 GHSA-m252-h4rm-hqfr

Linksys FGW3000-AH/FGW3000-HK HTTP POST Request sysconf.cgi sub_4153FC command injection

LOW 34CWE-74Published 2025-05-20 · Updated 2025-05-21

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-77.

Summary

A vulnerability was found in Linksys FGW3000-AH and FGW3000-HK up to 1.0.17.000000 and classified as critical. Affected by this issue is the function sub_4153FC of the file /cgi-bin/sysconf.cgi of the component HTTP POST Request Handler. The manipulation of the argument supplicant_rnd_id_en leads to command injection. The attack may 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0687 94th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linksys	FGW3000-AH	1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.0.5; 1.0.6; 1.0.7; 1.0.8; 1.0.9; 1.0.10; 1.0.11; 1.0.12; 1.0.13; 1.0.14; 1.0.15; 1.0.16; 1.0.17.000000	—	No fix listed	CNA
Linksys	FGW3000-HK	1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.0.5; 1.0.6; 1.0.7; 1.0.8; 1.0.9; 1.0.10; 1.0.11; 1.0.12; 1.0.13; 1.0.14; 1.0.15; 1.0.16; 1.0.17.000000	—	No fix listed	CNA

FGW3000-AH VendorLinksys Affected 1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.0.5; 1.0.6; 1.0.7; 1.0.8; 1.0.9; 1.0.10; 1.0.11; 1.0.12; 1.0.13; 1.0.14; 1.0.15; 1.0.16; 1.0.17.000000 Fixed in — No fix listed CNA
FGW3000-HK VendorLinksys Affected 1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.0.5; 1.0.6; 1.0.7; 1.0.8; 1.0.9; 1.0.10; 1.0.11; 1.0.12; 1.0.13; 1.0.14; 1.0.15; 1.0.16; 1.0.17.000000 Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:o:linksys:fgw3000-ah_firmware::::::::	up to 1.0.17.000000	Vulnerable	Linksys
cpe:2.3:h:linksys:fgw3000-ah:-:::::::*	not specified by NVD	Running on	Linksys
cpe:2.3:o:linksys:fgw3000-hk_firmware::::::::	up to 1.0.17.000000	Vulnerable	Linksys
cpe:2.3:h:linksys:fgw3000-hk:-:::::::*	not specified by NVD	Running on	Linksys

cpe:2.3:o:linksys:fgw3000-ah_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.000000 Vulnerable ·Linksys
cpe:2.3:h:linksys:fgw3000-ah:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linksys
cpe:2.3:o:linksys:fgw3000-hk_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.000000 Vulnerable ·Linksys
cpe:2.3:h:linksys:fgw3000-hk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linksys

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-4999
2026-10-03 Alias added: GHSA-m252-h4rm-hqfr

References

Exploit 1

https://github.com/CH13hh/tmp_store_cc/blob/main/FGW3000/1.md

Other 1

https://www.linksys.com/

TI-2025-04482 Linksys FGW3000-AH/FGW3000-HK HTTP POST Request sysconf.cgi control_panel_sw command injection CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences