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PatchSiren cyber security CVE debrief

CVE-2019-17621 D-Link CVE debrief

CISA’s Known Exploited Vulnerabilities catalog lists CVE-2019-17621 as a command execution vulnerability affecting the D-Link DIR-859 Router. Because it is on the KEV list, defenders should treat it as urgent and follow vendor remediation guidance. If a fix is not available for the affected deployment, CISA advises discontinuing use of the product.

Vendor
D-Link
Product
DIR-859 Router
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-06-29
Original CVE updated
2023-06-29
Advisory published
2023-06-29
Advisory updated
2023-06-29

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-17621 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-17621

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-17621 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-17621

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.