CVE-2026-77022Public exploitNetwork attack vector

Memory corruption via unchecked ssid formatting

Published Aug 20, 2026 · Updated Aug 20, 2026

Stack-based buffer overflow in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to corrupt memory via the ssid parameter. In sub_44B438, the SSID handler reads ssid from the request and formats it into a fixed 64-byte stack buffer as ptest set ssid %s without length validation or bounds checks. Exploitation requires a valid session for a POST request to /cgi-bin/mbox-config?method=SET&section=ptest_ssid; the public issue report demonstrates a crash and states that overwritten control data can yield code execution in the web service context.

CVSS severityUnavailable
Unscored
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in COMFAST CF-N1-S 2.6.0.1 allows remote authenticated users to corrupt memory via the ssid parameter. In sub_44B438, the SSID handler reads ssid from the request and formats it into a fixed 64-byte stack buffer as ptest set ssid %s without length validation or bounds checks. Exploitation requires a valid session for a POST request to /cgi-bin/mbox-config?method=SET&section=ptest_ssid; the public issue report demonstrates a crash and states that overwritten control data can yield code execution in the web service context.

The record

CVE
CVE-2026-77022
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
COMFAST
Product
CF-N1-S
Classifications
CWE-121, CWE-119, T1190
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

9.9VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
9.4VulDB CNACVSS: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
9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
9.9VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

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-121Stack-based Buffer Overflow
CWE-119Memory Corruption
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

See the directory against your own environment.

Your stack

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