CVE-2026-4497Public exploitNetwork attack vector

Unauthenticated command execution via firmware upgrade handler

Published Mar 20, 2026 · Updated Mar 20, 2026

OS command injection in TOTOLINK WA300 5.2cu.7112_B20190227 allows remote attackers to execute arbitrary commands through its web interface. The recvUpgradeNewFw handler in /cgi-bin/cstecgi.cgi fails to neutralize untrusted firmware-upgrade input before using it in an operating-system command. No authentication or user interaction is required; successful exploitation grants command execution on the appliance.

CVSS severity9.8
Critical
EPSS probability2.10%
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 arbitrary commands through its web interface. The recvUpgradeNewFw handler in /cgi-bin/cstecgi.cgi fails to neutralize untrusted firmware-upgrade input before using it in an operating-system command. No authentication or user interaction is required; successful exploitation grants command execution on the appliance.

The record

CVE
CVE-2026-4497
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
TOTOLINK
Product
WA300
Classifications
CWE-77, CWE-78, T1190, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A: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-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application
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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