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Exploited vulnerability · CISA KEV

Is CVE-2021-20124 exploited? Yes: in CISA KEV since 3 Sep 2024

Gociux · DrayTek VigorConnect · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-20124, Draytek VigorConnect Path Traversal Vulnerability , is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Sep 2024, 1056 days after it was published. It affects DrayTek VigorConnect. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 3 Sep 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.5CVSS 3.1 · high
US federal due24 Sep 2024BOD 22-01 deadline

What it is

Draytek VigorConnect contains a path traversal vulnerability in the file download functionality of the WebServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

VendorDrayTek (5 exploited CVEs in KEV)
ProductVigorConnect
VulnerabilityDraytek VigorConnect Path Traversal Vulnerability
WeaknessCWE-22
Published13 Oct 2021
Added to KEV3 Sep 2024
Reported by (CNA)tenable

What to do

  1. Check whether you run it. Look for VigorConnect in your asset inventory, including appliances and cloud images. Stack check lists every exploited DrayTek CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations 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 13 Oct 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for DrayTek.

Other exploited CVEs in VigorConnect

References

Questions

Is CVE-2021-20124 being exploited?

Yes. CISA added CVE-2021-20124 to the Known Exploited Vulnerabilities catalog on 3 Sep 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-20124 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-2021-20124?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check DrayTek's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected VigorConnect 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 September 2024 · DrayTek scorecard · act-now radar.

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