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Exploited vulnerability · CISA KEV

Is CVE-2019-17621 exploited? Yes: in CISA KEV since 29 Jun 2023

Gociux · D-Link DIR-859 Router · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-17621, D-Link DIR-859 Router Command Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 29 Jun 2023, 1277 days after it was published. It affects D-Link DIR-859 Router. If you run it, CISA's required action is: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

exploitedYesCISA KEV · 29 Jun 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due20 Jul 2023BOD 22-01 deadline

What it is

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.

VendorD-Link (26 exploited CVEs in KEV)
ProductDIR-859 Router
VulnerabilityD-Link DIR-859 Router Command Execution Vulnerability
WeaknessCWE-78
Published30 Dec 2019
Added to KEV29 Jun 2023
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for DIR-859 Router in your asset inventory, including appliances and cloud images. Stack check lists every exploited D-Link CVE at once.
  2. Apply the fix. Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 30 Dec 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for D-Link.

Other exploited CVEs in DIR-859 Router

References

Questions

Is CVE-2019-17621 being exploited?

Yes. CISA added CVE-2019-17621 to the Known Exploited Vulnerabilities catalog on 29 Jun 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-17621 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2019-17621?

Apply updates per vendor instructions or discontinue use of the product if updates are unavailable. Check D-Link's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected DIR-859 Router and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2023 · D-Link scorecard · act-now radar.

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