CVE-2021-40668: The Android application HTTP File Server (Version 1.4.1) by 'slowscript' is affected by a path traversal vulne

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HIGH 8.1DOWNGRADE

CVE-2021-40668 is a high-severity flaw (CVSS 8.1) affecting http file server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Android application HTTP File Server (Version 1.4.1) by 'slowscript' is affected by a path traversal vulnerability that permits arbitrary directory listing, file read, and file write.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-06-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: http file server project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-09 13:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

http file server project http file server DOWNGRADE

Affected: 1.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.1

1. Check installed version

apt-cache policy http-file-server || rpm -q http-file-server || http-file-server --version

2. No fixed release: DOWNGRADE to a release before 1.4.1 (Debian / Ubuntu)

apt-cache madison http-file-server sudo apt install http-file-server=<VERSION_BEFORE_1.4.1> sudo apt-mark hold http-file-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list http-file-server sudo dnf downgrade http-file-server-<VERSION_BEFORE_1.4.1> sudo dnf versionlock add http-file-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-40668?

http file server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40668 being exploited?

CVE-2021-40668 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-40668 affect?

CVE-2021-40668 affects http file server. Severity is high (CVSS 8.1). The Android application HTTP File Server (Version 1.4.1) by 'slowscript' is affected by a path traversal vulnerability that permits arbitrary directory listing, file read, and file write.

How urgent is CVE-2021-40668?

Priority 51/100. High severity; Public exploit reference

Software pages

Android vulnerabilities

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References

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