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CVE

CVE-2021-40870

Aviatrix Controller Unrestricted Upload of File

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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.9426
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules3 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-23Relative Path Traversal
▤

Affected Products & Versions

4
aviatrix controller>= 6.2 and < 6.2.2043
aviatrix controller>= 6.3 and < 6.3.2490
aviatrix controller>= 6.4 and < 6.4.2838
aviatrix controller>= 6.5 and < 6.5.1922
⚠

Public Exploits & PoCs

3
nucleiAviatrix Controller 6.x before 6.5-1804.1922 - Remote Command Executioncritical
pocpacketstormsecurity.com · Aviatrix-Controller-6.x-Path-Traversal-Code-Execution.htmlpacketstormsecurity.com
pocwearetradecraft.com · tc-2021-0002wearetradecraft.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Aviatrix Controller Unrestricted File Upload with Path Traversal Inbound (CVE-2021-40870)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

3
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumKubernetes Admission Controller Modification
productmediumAzure Kubernetes Admission Controller
productmediumGoogle Cloud Kubernetes Admission Controller
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Sep 2021 · 08:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2021-40870
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://docs.aviatrix.com/HowTos/UCC_Release_Notes.html#security-note-9-11-2021Release NotesVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40870US Government Resource
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