CVE-2025-41756: A low-privileged remote attacker can exploit the ubr-editfile method in wwwubr.cgi, an undocumented and unused

Q: How do I fix CVE-2025-41756?

universal bacnet router firmware: upgrade to 6.0.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-41756 being exploited?

CVE-2025-41756 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-2025-41756 affect?

CVE-2025-41756 affects universal bacnet router firmware. Severity is high (CVSS 8.1). A low-privileged remote attacker can exploit the ubr-editfile method in wwwubr.cgi, an undocumented and unused API endpoint to write arbitrary files on the system.

Routine

HIGH 8.1UPGRADE

CVE-2025-41756 is a high-severity flaw (CVSS 8.1) affecting universal bacnet router firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A low-privileged remote attacker can exploit the ubr-editfile method in wwwubr.cgi, an undocumented and unused API endpoint to write arbitrary files on the system.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-1242
Published	2026-03-09
Last modified	2026-06-17

Publisher (CNA): CERT VDE · Vendor: mbs-solutions

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

Am I affected?

Timeline

2026-03-09 09:15 UTCPublished CVE record published
2026-06-17 09:23 UTCUpdated Record last modified

mbs-solutions universal bacnet router firmware UPGRADE

Affected: < 6.0.1.0

Fixed in: 6.0.1.0

Safe to downgrade to: no unaffected older release

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-2025-41756?

universal bacnet router firmware: upgrade to 6.0.1.0. Exact commands for each OS are on this page.

Is CVE-2025-41756 being exploited?

CVE-2025-41756 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-2025-41756 affect?

CVE-2025-41756 affects universal bacnet router firmware. Severity is high (CVSS 8.1). A low-privileged remote attacker can exploit the ubr-editfile method in wwwubr.cgi, an undocumented and unused API endpoint to write arbitrary files on the system.

How urgent is CVE-2025-41756?

Priority 35/100. High severity

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References

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