CVE-2024-44844Public exploitNetwork attack vector

Authenticated command execution via incomplete name filtering

Published Sep 6, 2024 · Updated Sep 10, 2024

Command injection in DrayTek Vigor3900 Firmware 1.5.1.6 allows remote authenticated users to execute arbitrary commands via crafted HTTP requests. In /www/cgi-bin/mainfunction.cgi, filter_string passes the name field to run_command after replacing several metacharacters but leaving spaces and single ampersands intact. A valid SESSION_ID_VIGOR cookie is required; a crafted get_cert_content request can run shell commands with the appliance service's privileges.

CVSS severity8.8
High
EPSS probability1.90%
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 DrayTek Vigor3900 Firmware 1.5.1.6 allows remote authenticated users to execute arbitrary commands via crafted HTTP requests. In /www/cgi-bin/mainfunction.cgi, filter_string passes the name field to run_command after replacing several metacharacters but leaving spaces and single ampersands intact. A valid SESSION_ID_VIGOR cookie is required; a crafted get_cert_content request can run shell commands with the appliance service's privileges.

The record

CVE
CVE-2024-44844
Published
Sep 6, 2024
Updated
Sep 10, 2024
Vendor
DrayTek
Product
Vigor3900 Firmware
Classifications
CWE-78, CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=1.5.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

DrayTek · Vigor3900 Firmwareversion=1.5.1.6

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.

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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('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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