CVE-2021-44663: A Remote Code Execution (RCE) vulnerability exists in the Xerte Project Xerte through 3.8.4 via a crafted php

Q: How do I fix CVE-2021-44663?

xerte online toolkits: upgrade to newer than 3.8.4. Exact commands for each OS are on this page.

Q: Is CVE-2021-44663 being exploited?

CVE-2021-44663 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-2021-44663 affect?

CVE-2021-44663 affects xerte online toolkits. Severity is critical (CVSS 9.8). A Remote Code Execution (RCE) vulnerability exists in the Xerte Project Xerte through 3.8.4 via a crafted php file through elfinder in connetor.php.

Q: How urgent is CVE-2021-44663?

Priority 67/100. Critical severity; EPSS top 10%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-44663 is a critical-severity flaw (CVSS 9.8) affecting xerte online toolkits. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Remote Code Execution (RCE) vulnerability exists in the Xerte Project Xerte through 3.8.4 via a crafted php file through elfinder in connetor.php.

Why this priority

Critical severity
EPSS top 10%: very likely to be exploited
Public exploit reference
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	4.0% (top 10%)
CISA exploited list	No
Published	2022-02-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nottingham.ac

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

Am I affected?

Timeline

2022-02-24 19:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

nottingham.ac xerte online toolkits UPGRADE

Affected: <= 3.8.4

Fixed in: newer than 3.8.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xerte-online-toolkits || rpm -q xerte-online-toolkits || xerte-online-toolkits --version

2. UPGRADE to newer than 3.8.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xerte-online-toolkits

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xerte-online-toolkits

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-2021-44663?

xerte online toolkits: upgrade to newer than 3.8.4. Exact commands for each OS are on this page.

Is CVE-2021-44663 being exploited?

CVE-2021-44663 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-2021-44663 affect?

CVE-2021-44663 affects xerte online toolkits. Severity is critical (CVSS 9.8). A Remote Code Execution (RCE) vulnerability exists in the Xerte Project Xerte through 3.8.4 via a crafted php file through elfinder in connetor.php.

How urgent is CVE-2021-44663?

Priority 67/100. Critical severity; EPSS top 10%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-32985 CRITICAL 9.8 UPGRADE Xerte Online Toolkits versions 3.14 and earlier contain an unauthenticated arbitrary file upload vulnerability
CVE-2021-44662 MEDIUM 6.1 UPGRADE A Site Scripting (XSS) vulnerability exists in the Xerte Project Xerte through 3.8.4 via the link parameter in

References

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