CVE-2019-17621
CriticalExploitedPublic exploitThe 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.
Published Dec 30, 2019 · Updated Nov 7, 2025
Key Facts
Patch immediately- CVE-2019-17621 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Dir-818lx Firmware (Dlink), Dir-822 Firmware (Dlink), Dir-823 Firmware (Dlink) and 11 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 22, 2023. Public exploit code is available.
- EPSS estimates a 90% probability of exploitation in the next 30 days.
- Fixed versions are available, including Dir-822 Firmware <=2.03b01, Dir-823 Firmware <=1.00b06, Dir-859 Firmware <=1.05b03.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
90%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2019-17621 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jun 29, 2023 | Jul 20, 2023 | Not reported |
| Industry KEV feed | Jun 22, 2023 | Jul 20, 2023 | Not reported |
| CIRCL KEV | Jun 29, 2023 | Jul 20, 2023 | Not reported |
| ENISA EUVD | Jun 29, 2023 | n/a | Not reported |
Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Affected Products
19 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Dir-818lx FirmwareDlink | See advisory | n/a |
| Dir-822 FirmwareDlink | See advisory | 2.03b01 |
| Dir-823 FirmwareDlink | 1.00b06-beta | 1.00b06 |
| Dir-859 FirmwareDlink | 1.06b01-beta1 | 1.05b03 |
| Dir-865l FirmwareDlink | See advisory | 1.07b01 |
Patched Releases
Dir-822 Firmware
<=2.03b01
Dir-823 Firmware
<=1.00b06
Dir-859 Firmware
<=1.05b03
Dir-865l Firmware
<=1.07b01
Dir-868l Firmware
<=1.12b04
Dir-869 Firmware
<=1.03b02
Dir-880l Firmware
<=1.08b04
Dir-885l Firmware
<=1.12b05
Dir-885r Firmware
<=1.12b05
Dir-890l Firmware
<=1.11b01
Dir-890r Firmware
<=1.11b01
Dir-895l Firmware
<=1.12b10
Dir-895r Firmware
<=1.12b10
Timeline
Publicly disclosed
Dec 30, 2019
Added to Industry KEV feed
Jun 22, 2023
Added to CISA KEV
Jun 29, 2023
Added to CIRCL KEV
Jun 29, 2023
Added to ENISA EUVD
Jun 29, 2023
Last updated
Nov 7, 2025
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://www.dlink.com/en/security-bulletin
- advisoryhttps://www.ftc.gov/system/files/documents/cases/dlink_proposed_order_and_judgment_7-2-19.pdf
- patchhttps://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146
- patchhttps://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147
- exploithttp://packetstormsecurity.com/files/156054/D-Link-DIR-859-Unauthenticated-Remote-Command-Execution.html
FAQ
Common Questions.
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.
Affected: Dir-818lx Firmware (Dlink); Dir-822 Firmware (Dlink); Dir-823 Firmware (Dlink) versions 1.00b06-beta, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 22, 2023.
Yes. It was added on Jun 29, 2023 with a federal remediation due date of Jul 20, 2023.
Public exploit code is available.
Fixed versions are available, including Dir-822 Firmware <=2.03b01, Dir-823 Firmware <=1.00b06, Dir-859 Firmware <=1.05b03.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2019-17621 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo