CVE-2023-4746Public exploitNetwork attack vector

Authenticated command injection via format-string filter bypass

Published Sep 4, 2023 · Updated Aug 2, 2024

Command injection in Validity_check in TOTOLINK N200RE V5 9.3.5u.6437_B20230519 allows remote authenticated users to execute OS commands. The filter omits percent signs, allowing crafted ping or traceroute input to reach doSystem, where vsnprintf builds a command that system executes. Access requires a firmware web-interface account, and successful exploitation runs shell commands with the router service's privileges.

CVSS severity8.8
High
EPSS probability3.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Validity_check in TOTOLINK N200RE V5 9.3.5u.6437_B20230519 allows remote authenticated users to execute OS commands. The filter omits percent signs, allowing crafted ping or traceroute input to reach doSystem, where vsnprintf builds a command that system executes. Access requires a firmware web-interface account, and successful exploitation runs shell commands with the router service's privileges.

The record

CVE
CVE-2023-4746
Published
Sep 4, 2023
Updated
Aug 2, 2024
Vendor
TOTOLINK
Product
N200RE V5 Firmware
Classifications
CWE-134, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=9.3.5u.6437_B20230519

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · N200RE V5 Firmwareversion=9.3.5u.6437_B20230519

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String
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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