CVE-2021-41566: The file extension of the TadTools file upload function fails to filter, thus remote attackers can upload any

Q: How do I fix CVE-2021-41566?

tadtools: upgrade to 3.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-41566 being exploited?

CVE-2021-41566 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-41566 affect?

CVE-2021-41566 affects tadtools. Severity is critical (CVSS 9.8). The file extension of the TadTools file upload function fails to filter, thus remote attackers can upload any types of files and execute arbitrary code without logging in.

Q: How urgent is CVE-2021-41566?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-41566 is a critical-severity flaw (CVSS 9.8) affecting tadtools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The file extension of the TadTools file upload function fails to filter, thus remote attackers can upload any types of files and execute arbitrary code without logging in.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-10-08
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: tadtools project

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

Am I affected?

Timeline

2021-10-08 16:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

tadtools project tadtools UPGRADE

Affected: < 3.2.2

Fixed in: 3.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tadtools || rpm -q tadtools || tadtools --version

2. UPGRADE to 3.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tadtools

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tadtools

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-41566?

tadtools: upgrade to 3.2.2. Exact commands for each OS are on this page.

Is CVE-2021-41566 being exploited?

CVE-2021-41566 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-2021-41566 affect?

CVE-2021-41566 affects tadtools. Severity is critical (CVSS 9.8). The file extension of the TadTools file upload function fails to filter, thus remote attackers can upload any types of files and execute arbitrary code without logging in.

How urgent is CVE-2021-41566?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-41975 HIGH 7.5 UPGRADE TadTools special page is vulnerable to authorization bypass, thus remote attackers can use the specific parame
CVE-2021-41565 MEDIUM 6.1 UPGRADE TadTools special page parameter does not properly restrict the input of specific characters, thus remote attac

References

← Back to latest CVEs