CVE-2021-40870

Q: How do I fix CVE-2021-40870?

Upgrade controller to 6.5.1922 or later.

Q: Is CVE-2021-40870 being actively exploited?

Yes. CVE-2021-40870 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-02-01. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2021-40870?

CVE-2021-40870 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-40870 affect?

Published advisories record a fix for controller (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-23

How to fix

Remediation Available

controllerNVD

Affected:>= 6.5, < 6.5.1922Fixed in:6.5.1922CVE-2021-40870derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

93.02%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Aviatrix Controller Unrestricted Upload of File

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

Apply updates per vendor instructions.

Remediation due: 2022-02-01

References

Exploit2

Vendor Advisory1

docs.aviatrix.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-23 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-27199	High	7.3	100%	KEV + Ransom	Fix
CVE-2020-5410	High	7.5	96%	KEV	Fix
CVE-2025-64446	Critical	9.8	92%	KEV	Fix
CVE-2020-5405	Medium	6.5	69%	-	Fix
CVE-2025-55752	High	7.5	67%	-	Fix
CVE-2020-17518	High	7.5	50%	-	Fix

Common questions

How do I fix CVE-2021-40870?

Upgrade controller to 6.5.1922 or later.

Is CVE-2021-40870 being actively exploited?

Yes. CVE-2021-40870 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-02-01. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2021-40870?

CVE-2021-40870 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-40870 affect?

Published advisories record a fix for controller (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-40870

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-10.