CVE-2026-6139Public exploitNetwork attack vector

Unauthenticated command execution via certificate filename interpolation

Published Apr 13, 2026 · Updated Apr 14, 2026

Command injection in TOTOLINK A7100RU 7.4cu.2313_b20191024 allows remote attackers to execute OS commands via certificate uploads. UploadOpenVpnCert in /cgi-bin/cstecgi.cgi interpolates the untrusted FileName value into a command passed to CsteSystem without neutralizing command syntax. Exploitation requires network access to the CGI interface; the CNA reports no authentication requirement, although the published demonstration includes a session cookie.

CVSS severityUnavailable
Unscored
EPSS probability3.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in TOTOLINK A7100RU 7.4cu.2313_b20191024 allows remote attackers to execute OS commands via certificate uploads. UploadOpenVpnCert in /cgi-bin/cstecgi.cgi interpolates the untrusted FileName value into a command passed to CsteSystem without neutralizing command syntax. Exploitation requires network access to the CGI interface; the CNA reports no authentication requirement, although the published demonstration includes a session cookie.

The record

CVE
CVE-2026-6139
Published
Apr 13, 2026
Updated
Apr 14, 2026
Vendor
TOTOLINK
Product
A7100RU
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=7.4cu.2313_b20191024

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · A7100RUversion=7.4cu.2313_b20191024

Published CVSS scores

10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.8VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78OS Command Injection
CWE-77Command 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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