CVE-2021-43775Public exploitNetwork attack vector

Arbitrary file reading via unchecked static path

Published Nov 23, 2021 · Updated Aug 4, 2024

Path traversal in Aim before 3.1.0 allows remote attackers to read arbitrary server files through the static-files endpoint. The serve_static_files handler joins untrusted path input beneath ui/build and passes the result to FileResponse without verifying that the resolved path remains inside that directory. No authentication or user interaction is required, and disclosure is limited to files readable by the Aim process.

CVSS severity8.6
High
EPSS probability1.91%
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 Aim before 3.1.0 allows remote attackers to read arbitrary server files through the static-files endpoint. The serve_static_files handler joins untrusted path input beneath ui/build and passes the result to FileResponse without verifying that the resolved path remains inside that directory. No authentication or user interaction is required, and disclosure is limited to files readable by the Aim process.

The record

CVE
CVE-2021-43775
Published
Nov 23, 2021
Updated
Aug 4, 2024
Vendor
AimStack
Product
Aim
Classifications
CWE-73, CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 23, 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=< 3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AimStack · Aimversion=< 3.1.0

Published CVSS scores

7.1GitHubCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
8.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

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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