CVE-2024-51255Network attack vector

Unauthenticated command execution via ruequest_certificate injection

Published Oct 31, 2024 · Updated Oct 31, 2024

Command injection in DrayTek Vigor3900 Firmware 1.5.1.3 allows remote attackers to execute arbitrary commands through mainfunction.cgi. The ruequest_certificate function fails to neutralize attacker-controlled shell metacharacters before command execution. The CGI endpoint is network reachable without authentication, and successful exploitation grants command execution with the firmware process's privileges.

CVSS severity9.8
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command injection in DrayTek Vigor3900 Firmware 1.5.1.3 allows remote attackers to execute arbitrary commands through mainfunction.cgi. The ruequest_certificate function fails to neutralize attacker-controlled shell metacharacters before command execution. The CGI endpoint is network reachable without authentication, and successful exploitation grants command execution with the firmware process's privileges.

The record

CVE
CVE-2024-51255
Published
Oct 31, 2024
Updated
Oct 31, 2024
Vendor
DrayTek
Product
Vigor3900 Firmware
Classifications
CWE-77, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DrayTek · Vigor3900 Firmwareversion=1.5.1.3

Published CVSS scores

9.8CISA-ADPCVSS: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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo