No exploitation reported

CVE-2025-4999

No exploitation reported by the sources we read.

Published2025-05-20
WeaknessCWE-74 · CWE-77

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2025-05-2021:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-4999?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-4999?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Linksys fgw3000-ah firmwareversion to verify

Branch	Affected	Fixed in	Source
1.0	≤ 1.0.17.000000	no fix published	NVD

Linksys fgw3000-hk firmwareversion to verify

Branch	Affected	Fixed in	Source
1.0	≤ 1.0.17.000000	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-05-21
OpenCVESSVC decisionnone—
CNACVSS 4.05.3read 2026-10-23
CNACVSS 3.16.3read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNACVSS 2.06.5read 2026-10-23
CNAweakness (CWE)CWE-74, CWE-77read 2026-10-23
NVDweakness (CWE)CWE-77read 2026-10-23
FIRST EPSSEPSS score6.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: 2025-05-20
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2025-4999?

Is CVE-2025-4999 actively exploited?

Active exploitation of CVE-2025-4999 has not been confirmed. Its EPSS score was 6.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-4999?

CVE-2025-4999 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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