CVE-2026-7203Public exploitNetwork attack vector

Unauthenticated command execution via unsanitized enable parameter

Published Apr 28, 2026 · Updated Apr 28, 2026

OS command injection in TOTOLINK A8000RU 7.1cu.643_b20200521 allows remote attackers to execute arbitrary commands via the CGI handler. setUrlFilterRules inserts the enable value into a command string with snprintf, then CsteSystem reaches execv without neutralizing shell metacharacters. The published scoring treats exploitation as unauthenticated, although the demonstrated request includes a SESSION_ID cookie; commands run with the CGI service's privileges.

CVSS severity9.8
Critical
EPSS probability2.45%
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 A8000RU 7.1cu.643_b20200521 allows remote attackers to execute arbitrary commands via the CGI handler. setUrlFilterRules inserts the enable value into a command string with snprintf, then CsteSystem reaches execv without neutralizing shell metacharacters. The published scoring treats exploitation as unauthenticated, although the demonstrated request includes a SESSION_ID cookie; commands run with the CGI service's privileges.

The record

CVE
CVE-2026-7203
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
TOTOLINK
Product
A8000RU
Classifications
CWE-77, CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=7.1cu.643_b20200521

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · A8000RUversion=7.1cu.643_b20200521

Published CVSS scores

8.9VulDBCVSS: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
10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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')
T1059Command and Scripting Interpreter

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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