CVE-2026-77683Public exploitNetwork attack vector

Authenticated root command execution via unsanitized timestr

Published Aug 21, 2026 · Updated Aug 21, 2026

OS command injection in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to execute arbitrary commands via an HTTP POST request. The webmgnt function sub_41AD7C passes the user-controlled timestr value through sprintf without validation and supplies the resulting date command to system. A valid session, a nonempty timestr value, and ntp_client_enabled set to 0 are required; successful exploitation executes commands as root.

CVSS severity9.9
Critical
EPSS probability1.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to execute arbitrary commands via an HTTP POST request. The webmgnt function sub_41AD7C passes the user-controlled timestr value through sprintf without validation and supplies the resulting date command to system. A valid session, a nonempty timestr value, and ntp_client_enabled set to 0 are required; successful exploitation executes commands as root.

The record

CVE
CVE-2026-77683
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
COMFAST
Product
CF-N1-S
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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

8.6VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
9.9VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C

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 exploitPublished

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')
T1059.004Unix Shell

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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