CVE-2020-4039Network attack vector

Unauthenticated file access and deletion via path traversal

Published Apr 30, 2021 · Updated Aug 4, 2024

Path traversal in FOSSASIA SUSI.AI Server through d27ed0f allows remote attackers to read, move, or delete application-accessible files. Insufficient path validation accepts traversal input, although FOSSASIA has not identified the affected request handler or disclosed the exact faulty operation. No authentication or user interaction is required; exposed data includes administrative configuration and other files readable by the server process.

CVSS severity8.6
High
EPSS probability1.37%
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 FOSSASIA SUSI.AI Server through d27ed0f allows remote attackers to read, move, or delete application-accessible files. Insufficient path validation accepts traversal input, although FOSSASIA has not identified the affected request handler or disclosed the exact faulty operation. No authentication or user interaction is required; exposed data includes administrative configuration and other files readable by the server process.

The record

CVE
CVE-2020-4039
Published
Apr 30, 2021
Updated
Aug 4, 2024
Vendor
FOSSASIA
Product
SUSI.AI Server
Classifications
CWE-23, CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<=d27ed0f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FOSSASIA · SUSI.AI Serverversion=<=d27ed0f

Published CVSS scores

9.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
6.4NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:N

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-23Relative Path Traversal
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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