CVE-2020-10826Public exploitNetwork attack vector

Unauthenticated command execution via debug Referer logging

Published Mar 26, 2020 · Updated May 5, 2025

Command injection in DrayTek Vigor3900, Vigor2960, and Vigor300B before 1.5.1 allows remote attackers to execute system commands over HTTP. In DEBUG mode, /cgi-bin/activate.cgi incorporates the HTTP Referer header into a debug-log shell command and passes the resulting string to system without neutralizing command syntax. DEBUG mode must be enabled; otherwise the vulnerable logging path is not reached, while successful injection runs arbitrary commands on the appliance.

CVSS severity9.8
Critical
EPSS probability39.39%
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, Vigor2960, and Vigor300B before 1.5.1 allows remote attackers to execute system commands over HTTP. In DEBUG mode, /cgi-bin/activate.cgi incorporates the HTTP Referer header into a debug-log shell command and passes the resulting string to system without neutralizing command syntax. DEBUG mode must be enabled; otherwise the vulnerable logging path is not reached, while successful injection runs arbitrary commands on the appliance.

The record

CVE
CVE-2020-10826
Published
Mar 26, 2020
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2020CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 exploitPublished

Weakness, pattern, technique

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