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CVE-2021-40870

CRITICAL
9.8
CVSS Score
Published: September 13, 2021 at 07:41 AM UTC
Updated: June 17, 2026 at 04:07 AM UTC
1 product affected across 1 vendorController

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 93%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score93.0%

EPSS (Exploit Prediction Scoring System) estimates a 93.0% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Jan 18, 2022
Remediation Due
Feb 1, 2022
1736 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-40870

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Controller· Aviatrix
95%
6.2 ≤ v < 6.2.20436.3 ≤ v < 6.3.24906.4 ≤ v < 6.4.28386.5 ≤ v < 6.5.1922
Affected range stops below 6.2.2043, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.2490, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.2838, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.5.1922, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCExploitThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/164461/Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.html
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://wearetradecraft.com/advisories/tc-2021-0002/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40870

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-23

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