CVE-2021-40349: e7d Speed Test (aka speedtest) 0.5.3 allows a path-traversal attack that results in information disclosure via

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MEDIUM 5.3REMOTEDOWNGRADE

CVE-2021-40349 is a medium-severity flaw (CVSS 5.3) affecting speed test. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

e7d Speed Test (aka speedtest) 0.5.3 allows a path-traversal attack that results in information disclosure via the "GET /.." substring.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-09-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: speed test project

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

Am I affected?

Timeline

2021-09-27 06:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

speed test project speed test DOWNGRADE

Affected: 0.5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.3

1. Check installed version

apt-cache policy speed-test || rpm -q speed-test || speed-test --version

2. No fixed release: DOWNGRADE to a release before 0.5.3 (Debian / Ubuntu)

apt-cache madison speed-test sudo apt install speed-test=<VERSION_BEFORE_0.5.3> sudo apt-mark hold speed-test

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

dnf --showduplicates list speed-test sudo dnf downgrade speed-test-<VERSION_BEFORE_0.5.3> sudo dnf versionlock add speed-test

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-2021-40349?

speed test: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40349 being exploited?

CVE-2021-40349 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-2021-40349 affect?

CVE-2021-40349 affects speed test. Severity is medium (CVSS 5.3). e7d Speed Test (aka speedtest) 0.5.3 allows a path-traversal attack that results in information disclosure via the "GET /.." substring.

How urgent is CVE-2021-40349?

Priority 40/100. Remotely exploitable, no login, no user action

References

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