How severe is CVE-2020-3921?

CVE-2020-3921 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-3921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-3921?

CVE-2020-3921 affects Unisoon Ultralog Express Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-3921?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-3921 published?

CVE-2020-3921 was published on 2020-03-27 and last updated on 2026-06-17.

CVE-2020-3921

CVE-2020-3921 is a high-severity vulnerability in Unisoon Ultralog Express Firmware with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-312.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 5.0
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-312
Affected product: Unisoon Ultralog Express Firmware
Published: 2020-03-27
Last modified: 2026-06-17

Description

UltraLog Express device management software stores user’s information in cleartext. Any user can obtain accounts information through a specific page.

Frequently asked questions

What is CVE-2020-3921?: UltraLog Express device management software stores user’s information in cleartext. Any user can obtain accounts information through a specific page.
How severe is CVE-2020-3921?: CVE-2020-3921 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-3921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-3921?: CVE-2020-3921 affects Unisoon Ultralog Express Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-3921?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-3921 published?: CVE-2020-3921 was published on 2020-03-27 and last updated on 2026-06-17.

References

https://www.twcert.org.tw/tw/cp-132-3453-442a5-1.html

Affected products (1)

cpe:2.3:o:unisoon:ultralog_express_firmware:1.4.0:*:*:*:*:*:*:*

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