CVE-2025-4999Network attack vector

Authenticated command execution via unsanitized POST parameter

Published May 20, 2025 · Updated May 21, 2025

Command injection in Linksys FGW3000-AH and FGW3000-HK 1.0.17.000000 and earlier allows remote authenticated users to execute commands. The sub_4153FC handler in /cgi-bin/sysconf.cgi passes the supplicant_rnd_id_en POST value into a command context without neutralizing shell metacharacters. The management interface must be reachable with valid credentials; the record does not establish privileges beyond command execution on the device.

CVSS severity9.8
Critical
EPSS probability7.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Linksys FGW3000-AH and FGW3000-HK 1.0.17.000000 and earlier allows remote authenticated users to execute commands. The sub_4153FC handler in /cgi-bin/sysconf.cgi passes the supplicant_rnd_id_en POST value into a command context without neutralizing shell metacharacters. The management interface must be reachable with valid credentials; the record does not establish privileges beyond command execution on the device.

The record

CVE
CVE-2025-4999
Published
May 20, 2025
Updated
May 21, 2025
Vendor
Linksys
Product
FGW3000-AH
Classifications
CWE-77, CWE-74, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0
  2. Affected versionversion=1.0.1
  3. Affected versionversion=1.0.10
  4. Affected versionversion=1.0.11
  5. Affected versionversion=1.0.12
  6. Affected versionversion=1.0.13
  7. Affected versionversion=1.0.14
  8. Affected versionversion=1.0.15
  9. Affected versionversion=1.0.16
  10. Affected versionversion=1.0.17.000000
  11. Affected versionversion=1.0.2
  12. Affected versionversion=1.0.3
  13. Affected versionversion=1.0.4
  14. Affected versionversion=1.0.5
  15. Affected versionversion=1.0.6
  16. Affected versionversion=1.0.7
  17. Affected versionversion=1.0.8
  18. Affected versionversion=1.0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linksys · FGW3000-AHversion=1.0.0; version=1.0.1; version=1.0.10; version=1.0.11; version=1.0.12; version=1.0.13; version=1.0.14; version=1.0.15; version=1.0.16; version=1.0.17.000000; version=1.0.2; version=1.0.3; version=1.0.4; version=1.0.5; version=1.0.6; version=1.0.7; version=1.0.8; version=1.0.9
Linksys · FGW3000-HKversion=1.0.0; version=1.0.1; version=1.0.10; version=1.0.11; version=1.0.12; version=1.0.13; version=1.0.14; version=1.0.15; version=1.0.16; version=1.0.17.000000; version=1.0.2; version=1.0.3; version=1.0.4; version=1.0.5; version=1.0.6; version=1.0.7; version=1.0.8; version=1.0.9

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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