CVE-2026-0641Public exploitNetwork attack vector

Unauthenticated command execution via upload filename

Published Jan 6, 2026 · Updated Jan 6, 2026

OS command injection in TOTOLINK WA300 5.2cu.7112_B20190227 allows remote attackers to execute commands via a crafted upload filename. The cstecgi.cgi sub_401510 upload handler inserts the UPLOAD_FILENAME CGI value into a shell command with sprintf and passes the result to system() without validation or escaping. No authentication is required to reach action=upload on the web management interface, granting command execution in the web service context.

CVSS severity8.8
High
EPSS probability2.68%
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 TOTOLINK WA300 5.2cu.7112_B20190227 allows remote attackers to execute commands via a crafted upload filename. The cstecgi.cgi sub_401510 upload handler inserts the UPLOAD_FILENAME CGI value into a shell command with sprintf and passes the result to system() without validation or escaping. No authentication is required to reach action=upload on the web management interface, granting command execution in the web service context.

The record

CVE
CVE-2026-0641
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
TOTOLINK
Product
WA300
Classifications
CWE-74, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 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=5.2cu.7112_B20190227

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · WA300version=5.2cu.7112_B20190227

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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')
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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