CVE-2021-40668Public exploitNetwork attack vector

Arbitrary file access via path traversal

Published Jun 9, 2022 · Updated Aug 4, 2024

HTTP File Server 1.4.1 for Android allows remote authenticated users to read and write arbitrary files via path traversal. The server joins attacker-controlled path components to the configured root without preventing parent-directory traversal, so directory listings and file operations escape that root. Exploitation requires network access to the running application and its configured account; confidentiality and integrity are affected, while service availability is not reported as impacted.

CVSS severity8.1
High
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP File Server 1.4.1 for Android allows remote authenticated users to read and write arbitrary files via path traversal. The server joins attacker-controlled path components to the configured root without preventing parent-directory traversal, so directory listings and file operations escape that root. Exploitation requires network access to the running application and its configured account; confidentiality and integrity are affected, while service availability is not reported as impacted.

The record

CVE
CVE-2021-40668
Published
Jun 9, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1565, T1083, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2022CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
5.5NVDAV:N/AC:L/Au:S/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1565Data Manipulation
T1083File and Directory Discovery
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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