CVE-2019-17621: in the CISA KEV catalogue
D-Link DIR-859 Router Command Execution Vulnerability. CISA added CVE-2019-17621 to the Known Exploited Vulnerabilities catalogue on 2023-06-29 with a default due date of 2023-07-20. Known ransomware campaign use: Unknown. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- D-Link DIR-859 Router
- CWE
- CWE-78
- CISA required action
- Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
- EPSS
- 91%, percentile 99 (scored 2026-11-03)
EPSS puts about 91 in 100 odds (91%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2019-17621 in the CISA KEV catalogue?
Yes. CISA added CVE-2019-17621 (D-Link DIR-859 Router Command Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-06-29. CISA's default due date for it is 2023-07-20.
Is CVE-2019-17621 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2019-17621. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2019-17621?
CISA's required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2019-17621