CVE-2019-17621 D-Link CVE debrief

Who should care

Network and security teams responsible for D-Link DIR-859 routers, especially if the device is deployed in small office, branch office, or internet-exposed environments.

Technical summary

The official corpus identifies CVE-2019-17621 as a command execution vulnerability in the D-Link DIR-859 Router. The source corpus does not include exploit mechanics, attack preconditions, or a CVSS score. CISA’s KEV entry indicates the issue is known to be exploited in the wild and directs affected users to apply vendor updates or discontinue use if updates are unavailable.

Defensive priority

Urgent. CISA has listed this CVE in the Known Exploited Vulnerabilities catalog, which indicates confirmed real-world exploitation and an elevated remediation priority.

Recommended defensive actions

• Identify whether any D-Link DIR-859 routers are in your environment.
• Apply vendor updates or follow D-Link’s published remediation instructions for affected devices.
• If updates are unavailable for your deployment, discontinue use of the product and replace it.
• Use the CISA KEV due date as a remediation target and verify completion across all sites and inventories.

Evidence notes

CISA’s KEV metadata for this entry names the vendor as D-Link, the product as DIR-859 Router, and the vulnerability as a command execution issue. The entry was added on 2023-06-29 with a due date of 2023-07-20 and specifies: apply updates per vendor instructions or discontinue use of the product if updates are unavailable. The supplied corpus also links to the CVE record and NVD detail page. No CVSS score or technical exploit details were provided in the corpus.

Official resources