CVE-2025-4999
Published: 20 May 2025
Summary
CVE-2025-4999 is a medium-severity Injection (CWE-74) vulnerability in Linksys Fgw3000-Ah Firmware. Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 16.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A command injection vulnerability affects the Linksys FGW3000-AH and FGW3000-HK routers up to firmware version 1.0.17.000000. It resides in the sub_4153FC function within the /cgi-bin/sysconf.cgi HTTP POST Request Handler and is triggered by manipulation of the supplicant_rnd_id_en argument, corresponding to CWE-74 and CWE-77. The issue is remotely reachable and carries a CVSS 4.0 score of 5.3.
An authenticated remote attacker can supply a crafted POST request to execute arbitrary commands on the device, resulting in limited impacts to confidentiality, integrity, and availability. The exploit has been publicly disclosed via a detailed proof-of-concept and does not require user interaction.
No vendor patch or mitigation guidance is available; the vendor was notified prior to disclosure but provided no response. Public references include a GitHub repository containing the technical details along with VulDB entries tracking the issue.
The associated EPSS score remains flat at 0.0195 with no material increase since publication, and no confirmed in-the-wild exploitation has been reported.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-15959
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Developer assessments and testing (including injection-focused techniques) identify improper neutralization of special elements, and the verifiable flaw remediation corrects them pre-deployment.
Identifies indicators of injection attacks (command, SQL, LDAP, etc.) via anomaly and attack monitoring.