CVE-2026-9515Public exploitNetwork attack vector

Authenticated command execution via unvalidated plugin_version

Published May 25, 2026 · Updated May 25, 2026

OS command injection in TOTOLINK CA750-PoE 6.2c.510 allows remote authenticated users to execute commands through its web interface. The setUnloadUserData handler in upgrade.so passes the attacker-controlled plugin_version value into an operating-system command without neutralizing shell syntax. A valid session is required; a crafted POST to /cgi-bin/cstecgi.cgi can start a device-side Telnet service and expose a shell.

CVSS severity6.3
Medium
EPSS probability10.81%
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 CA750-PoE 6.2c.510 allows remote authenticated users to execute commands through its web interface. The setUnloadUserData handler in upgrade.so passes the attacker-controlled plugin_version value into an operating-system command without neutralizing shell syntax. A valid session is required; a crafted POST to /cgi-bin/cstecgi.cgi can start a device-side Telnet service and expose a shell.

The record

CVE
CVE-2026-9515
Published
May 25, 2026
Updated
May 25, 2026
Vendor
TOTOLINK
Product
CA750-PoE
Classifications
CWE-77, CWE-78, T1059.004, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 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=6.2c.510

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · CA750-PoEversion=6.2c.510

Published CVSS scores

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 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-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')
T1059.004Unix Shell
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

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Your stack

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