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Exploited vulnerability · CISA KEV

Is CVE-2021-40870 exploited? Yes: in CISA KEV since 18 Jan 2022

Gociux · Aviatrix Controller · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-40870, Aviatrix Controller Unrestricted Upload of File, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 18 Jan 2022, 127 days after it was published. It affects Aviatrix Controller. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 18 Jan 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due1 Feb 2022BOD 22-01 deadline

What it is

Unrestricted upload of a file with a dangerous type is possible, which allows an unauthenticated user to execute arbitrary code via directory traversal.

VendorAviatrix (2 exploited CVEs in KEV)
ProductAviatrix Controller
VulnerabilityAviatrix Controller Unrestricted Upload of File
WeaknessCWE-25, CWE-96
Published13 Sep 2021
Added to KEV18 Jan 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Aviatrix Controller in your asset inventory, including appliances and cloud images. Stack check lists every exploited Aviatrix CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  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 Sep 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Aviatrix.

References

Questions

Is CVE-2021-40870 being exploited?

Yes. CISA added CVE-2021-40870 to the Known Exploited Vulnerabilities catalog on 18 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-40870 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-2021-40870?

Apply updates per vendor instructions. Check Aviatrix's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Aviatrix Controller 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 January 2022 · Aviatrix scorecard · act-now radar.

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