CVE-2024-51251

Authenticated command execution via backup function

Published Nov 4, 2024 · Updated Nov 4, 2024

OS command injection in DrayTek Vigor3900 Firmware 1.5.1.3 allows remote authenticated users to execute arbitrary commands. The mainfunction.cgi backup function incorporates attacker-controlled input into an operating-system command without neutralizing shell metacharacters. Access requires low privileges from an adjacent network, and successful exploitation can compromise the router's confidentiality, integrity, and availability.

CVSS severity8.0
High
EPSS probability0.72%
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 DrayTek Vigor3900 Firmware 1.5.1.3 allows remote authenticated users to execute arbitrary commands. The mainfunction.cgi backup function incorporates attacker-controlled input into an operating-system command without neutralizing shell metacharacters. Access requires low privileges from an adjacent network, and successful exploitation can compromise the router's confidentiality, integrity, and availability.

The record

CVE
CVE-2024-51251
Published
Nov 4, 2024
Updated
Nov 4, 2024
Vendor
DrayTek
Product
Vigor3900 Firmware
Classifications
CWE-78, T1059
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=1.5.1.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

DrayTek · Vigor3900 Firmwareversion=1.5.1.3

Published CVSS scores

8.0CISA-ADPCVSS:3.1/AV:A/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.

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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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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