CVE-2019-17621

CVE-2019-17621 is a critical-severity vulnerability in Dlink Dir-859 Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-06-29). The underlying weakness is classified as CWE-78.

Key facts

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.

Frequently asked questions

What is CVE-2019-17621?
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 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-17621 being actively exploited?
Yes. CVE-2019-17621 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-06-29, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2019-17621?
CVE-2019-17621 primarily affects Dlink Dir-859 Firmware. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-17621?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2019-17621 have an EU (EUVD) identifier?
Yes. CVE-2019-17621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-7939. It is also flagged as exploited in the EUVD (since 2023-06-29).
When was CVE-2019-17621 published?
CVE-2019-17621 was published on 2019-12-30 and last updated on 2026-06-17.

References

Affected products (19)

More vulnerabilities in Dlink Dir-859 Firmware

All CVEs affecting Dlink Dir-859 Firmware →

Other CWE-78 (OS Command Injection) vulnerabilities

Browse all CWE-78 (OS Command Injection) vulnerabilities →