CVE-2019-20216Public exploitNetwork attack vector

Unauthenticated command execution via unfiltered REMOTE_PORT

Published Jan 29, 2020 · Updated Aug 5, 2024

OS command injection in D-Link DIR-859 firmware 1.05 and 1.06B01 Beta01 allows remote attackers to execute arbitrary commands over LAN. The ssdpcgi() handler passes attacker-controlled REMOTE_PORT data from a UPnP M-SEARCH request through vsnprintf() into lxmldbc_system(), where shell metacharacters concatenate commands without adequate filtering. Unauthenticated access to the router's LAN-side UPnP service is required, and successful exploitation runs commands with the service's device-level privileges.

CVSS severity9.8
Critical
EPSS probability3.67%
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 D-Link DIR-859 firmware 1.05 and 1.06B01 Beta01 allows remote attackers to execute arbitrary commands over LAN. The ssdpcgi() handler passes attacker-controlled REMOTE_PORT data from a UPnP M-SEARCH request through vsnprintf() into lxmldbc_system(), where shell metacharacters concatenate commands without adequate filtering. Unauthenticated access to the router's LAN-side UPnP service is required, and successful exploitation runs commands with the service's device-level privileges.

The record

CVE
CVE-2019-20216
Published
Jan 29, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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

10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NIST NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell
T1210Exploitation of Remote Services

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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