CVE-2025-63221: The Axel Technology puma devices (firmware versions 0.8.5 to 1.0.3) are vulnerable to Broken Access Control du

Q: How do I fix CVE-2025-63221?

puma firmware: upgrade to newer than 1.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-63221 being exploited?

CVE-2025-63221 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-2025-63221 affect?

CVE-2025-63221 affects puma firmware. Severity is critical (CVSS 9.1). The Axel Technology puma devices (firmware versions 0.8.5 to 1.0.3) are vulnerable to Broken Access Control due to missing authentication on the /cgi-bin/gstFcgi.fcgi endpoint. Unauthenticated remote attackers can list user accounts, create

Q: How urgent is CVE-2025-63221?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-63221 is a critical-severity flaw (CVSS 9.1) affecting puma firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Axel Technology puma devices (firmware versions 0.8.5 to 1.0.3) are vulnerable to Broken Access Control due to missing authentication on the /cgi-bin/gstFcgi.fcgi endpoint. Unauthenticated remote attackers can list user accounts, create new administrative users, delete users, and modify system settings, leading to full compromise of the device.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-11-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: axeltechnology

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

Am I affected?

Timeline

2025-11-19 16:15 UTCPublished CVE record published
2026-06-17 09:52 UTCUpdated Record last modified

axeltechnology puma firmware UPGRADE

Affected: >= 0.8.5 and <= 1.0.3

Fixed in: newer than 1.0.3

Safe to downgrade to: a release before 0.8.5

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2025-63221?

puma firmware: upgrade to newer than 1.0.3. Exact commands for each OS are on this page.

Is CVE-2025-63221 being exploited?

CVE-2025-63221 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-2025-63221 affect?

CVE-2025-63221 affects puma firmware. Severity is critical (CVSS 9.1). The Axel Technology puma devices (firmware versions 0.8.5 to 1.0.3) are vulnerable to Broken Access Control due to missing authentication on the /cgi-bin/gstFcgi.fcgi endpoint. Unauthenticated remote attackers can list user accounts, create

How urgent is CVE-2025-63221?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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