CVE-2026-77004Public exploitNetwork attack vector

Authenticated command injection via sn parameter

Published Aug 20, 2026 · Updated Aug 20, 2026

Command injection in /cgi-bin/mbox-config in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to execute OS commands via sn. In the ptest_sn handler, the CGI code uses sprintf while processing the sn parameter, allowing untrusted input to be incorporated into a command context without neutralizing shell metacharacters. Reachability is remote, but the published CVSS assessments require low privileges, and the cited GitHub proof of concept shows public exploit material rather than confirmed in-the-wild use.

CVSS severity7.4
High
EPSS probability1.28%
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 /cgi-bin/mbox-config in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to execute OS commands via sn. In the ptest_sn handler, the CGI code uses sprintf while processing the sn parameter, allowing untrusted input to be incorporated into a command context without neutralizing shell metacharacters. Reachability is remote, but the published CVSS assessments require low privileges, and the cited GitHub proof of concept shows public exploit material rather than confirmed in-the-wild use.

The record

CVE
CVE-2026-77004
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
COMFAST
Product
CF-N1-S
Classifications
CWE-74, CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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

5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

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 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 exploitPublished

Weakness, pattern, technique

CWE-74Injection
CWE-77Command Injection
T1059Command and Scripting Interpreter

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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