CVE-2026-19976Public exploitNetwork attack vector

Authenticated command execution via macaddress injection

Published Aug 17, 2026 · Updated Aug 17, 2026

Command injection in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to execute OS commands via the macaddress parameter. In /cgi-bin/mbox-config?method=SET&section=ptest_macaddress, function sub_44A968 places the JSON macaddress value into a shell command with sprintf() and executes it with popen() without sanitization or validation. Reachability requires a valid web-management session, but the published proof of concept shows firmware-level command execution and states that root-level actions can follow.

CVSS severity6.6
Medium
EPSS probability2.05%
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 COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to execute OS commands via the macaddress parameter. In /cgi-bin/mbox-config?method=SET&section=ptest_macaddress, function sub_44A968 places the JSON macaddress value into a shell command with sprintf() and executes it with popen() without sanitization or validation. Reachability requires a valid web-management session, but the published proof of concept shows firmware-level command execution and states that root-level actions can follow.

The record

CVE
CVE-2026-19976
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
COMFAST
Product
CF-N1-S
Classifications
CWE-74, CWE-77, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=2.6.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

COMFAST · CF-N1-Sversion=2.6.0.1

Published CVSS scores

5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P
6.6VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

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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