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Known exploited vulnerability · CISA KEV

CVE-2019-17621: D-Link DIR-859 Router Command Execution Vulnerability

D-Link DIR-859 router contains a command execution vulnerability in the UPnP endpoint URL, /gena.cgi. Exploitation 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.

CVE-2019-17621

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2023-06-29: attackers are using it right now.

CISA KEV
Listed
Added 2023-06-29 · federal fix-by 2023-07-20
EPSS (30 days)
91%
Higher than 99.8% of CVEs · 2026-11-01
CVSS v3.1
9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What CISA says

D-Link DIR-859 Router Command Execution Vulnerability

Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

NVD description · published 2019-12-30

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.

Full record on NVD

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How to check if you are exposed to CVE-2019-17621

  1. Find every D-Link DIR-859 Router system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2019-17621.

US federal agencies had to fix this by 2023-07-20. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2019-17621. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
D-Link Dir-859 Firmwareup to and including 1.05b03; 1.06b01-beta1
D-Link Dir-822 Firmwareup to and including 2.03b01; up to and including 3.12b04
D-Link Dir-823 Firmwareup to and including 1.00b06; 1.00b06-beta
D-Link Dir-865l Firmwareup to and including 1.07b01
D-Link Dir-868l Firmwareup to and including 1.12b04; up to and including 2.05b02
D-Link Dir-869 Firmwareup to and including 1.03b02; 1.03b02-beta02

NVD lists 8 more affected products; see the full record on NVD.

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 1,277 days after it was published
  3. · Fix-by date for US federal agencies, passed 1,200 days ago

Vendor advisories and fixes

Weakness type

More exploited D-Link vulnerabilities

CISA lists 26 exploited D-Link vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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