CVE-2020-3920: UltraLog Express device management interface does not properly perform access authentication in some specific

This month

HIGH 8.1MITIGATE

CVE-2020-3920 is a high-severity flaw (CVSS 8.1) affecting ultralog express firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

UltraLog Express device management interface does not properly perform access authentication in some specific pages/functions. Any user can access the privileged page to manage accounts through specific system directory.

Why this priority

High severity

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-306
Published	2020-03-27
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: unisoon

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

Am I affected?

Timeline

2020-03-27 04:15 UTCPublished CVE record published
2026-06-17 03:19 UTCUpdated Record last modified

unisoon ultralog express firmware MITIGATE

Affected: 1.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.0

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-2020-3920?

ultralog express firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-3920 being exploited?

CVE-2020-3920 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-2020-3920 affect?

CVE-2020-3920 affects ultralog express firmware. Severity is high (CVSS 8.1). UltraLog Express device management interface does not properly perform access authentication in some specific pages/functions. Any user can access the privileged page to manage accounts through specific system directory.

How urgent is CVE-2020-3920?

Priority 43/100. High severity

Related CVEs

CVE-2020-3936 CRITICAL 10.0 MITIGATE UltraLog Express device management interface does not properly filter user inputted string in some specific pa
CVE-2020-3921 HIGH 8.6 MITIGATE UltraLog Express device management software stores user’s information in cleartext

References

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