How severe is CVE-2021-40870?

CVE-2021-40870 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40870 being actively exploited?

Yes. CVE-2021-40870 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-18, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-40870?

CVE-2021-40870 affects Aviatrix Controller. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40870?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-40870 have an EU (EUVD) identifier?

Yes. CVE-2021-40870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-28025. It is also flagged as exploited in the EUVD (since 2022-01-18).

When was CVE-2021-40870 published?

CVE-2021-40870 was published on 2021-09-13 and last updated on 2026-06-17.

CVE-2021-40870

CVE-2021-40870 is a critical-severity vulnerability in Aviatrix Controller with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-01-18). The underlying weakness is classified as CWE-23.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 93% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-01-18)
EU (EUVD) id: EUVD-2021-28025
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-01-18)
Weakness: CWE-23
Affected product: Aviatrix Controller
Published: 2021-09-13
Last modified: 2026-06-17

Description

An issue was discovered in Aviatrix Controller 6.x before 6.5-1804.1922. Unrestricted upload of a file with a dangerous type is possible, which allows an unauthenticated user to execute arbitrary code via directory traversal.

Frequently asked questions

What is CVE-2021-40870?: An issue was discovered in Aviatrix Controller 6.x before 6.5-1804.1922. Unrestricted upload of a file with a dangerous type is possible, which allows an unauthenticated user to execute arbitrary code via directory traversal.
How severe is CVE-2021-40870?: CVE-2021-40870 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40870 being actively exploited?: Yes. CVE-2021-40870 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-18, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-40870?: CVE-2021-40870 affects Aviatrix Controller. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40870?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-40870 have an EU (EUVD) identifier?: Yes. CVE-2021-40870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-28025. It is also flagged as exploited in the EUVD (since 2022-01-18).
When was CVE-2021-40870 published?: CVE-2021-40870 was published on 2021-09-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:aviatrix:controller:*:*:*:*:*:*:*:*

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