CVE-2020-3936: UltraLog Express device management interface does not properly filter user inputted string in some specific pa

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CRITICAL 10.0REMOTEMITIGATE

CVE-2020-3936 is a critical-severity flaw (CVSS 10.0) 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 filter user inputted string in some specific parameters, attackers can inject arbitrary SQL command.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-89
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-2020-3936?

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

Is CVE-2020-3936 being exploited?

CVE-2020-3936 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-2020-3936 affect?

CVE-2020-3936 affects ultralog express firmware. Severity is critical (CVSS 10.0). UltraLog Express device management interface does not properly filter user inputted string in some specific parameters, attackers can inject arbitrary SQL command.

How urgent is CVE-2020-3936?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-3921 HIGH 8.6 MITIGATE UltraLog Express device management software stores user’s information in cleartext
CVE-2020-3920 HIGH 8.1 MITIGATE UltraLog Express device management interface does not properly perform access authentication in some specific

References

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