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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2019-17621

D-Link DIR-859 Router Command Execution Vulnerability

D-Link DIR-859 Router

The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.

CVSS
9.8
CRITICAL
EPSS
90.6%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
30 Dec 2019
CWE-78

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 29 June 2023. US federal agencies were required to remediate it by 20 July 2023.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 90.6%, which is higher than 99.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2019-17621 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2019-17621.

What does CVE-2019-17621 affect?

CVE-2019-17621 affects D-Link DIR-859 Router. The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.

How severe is CVE-2019-17621?

CVE-2019-17621 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 90.6%, higher than 99.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 20 July 2023.

How should organisations respond to CVE-2019-17621?

Apply the vendor patch for D-Link DIR-859 Router as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.