CVE-2021-41290Network attack vector

Unauthenticated code execution via traversal file upload

Published Sep 30, 2021 · Updated Sep 16, 2024

Path traversal in ECOA BAS controllers allows remote attackers to write arbitrary files and execute code through an unauthenticated upload. The upload function fails to filter special characters in attacker-controlled POST location and content-type parameters, allowing files to escape the intended directory. No authentication or user interaction is required, and successful writes grant administrator control of the affected device.

CVSS severity9.8
Critical
EPSS probability2.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in ECOA BAS controllers allows remote attackers to write arbitrary files and execute code through an unauthenticated upload. The upload function fails to filter special characters in attacker-controlled POST location and content-type parameters, allowing files to escape the intended directory. No authentication or user interaction is required, and successful writes grant administrator control of the affected device.

The record

CVE
CVE-2021-41290
Published
Sep 30, 2021
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, CWE-434, T0819
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-434Unrestricted Upload of File with Dangerous Type
T0819Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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