RCE in Linksys Fgw3000-Ah
CVE-2025-4999
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.071 (94.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.078 · newest: 0.071 · change: -0.007
Affected products
- Linksys Fgw3000-Ah — versions 1.0.0, 1.0.1, 1.0.2
- Linksys Fgw3000-Ah Firmware
- Linksys Fgw3000-Hk — versions 1.0.0, 1.0.1, 1.0.2
- Linksys Fgw3000-Hk Firmware
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/CH13hh/tmp_store_cc/blob/main/FGW3000/1.md (exploit, broken-link, Broken Link)
- www.linksys.com/ (Product, product)
Frequently asked questions
- What is CVE-2025-4999?
- CVE-2025-4999 is a medium-severity vulnerability in Linksys Fgw3000-Ah, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2025-05-20.
- How severe is CVE-2025-4999?
- Medium severity. CVSS v3 base score is 6.3 out of 10.