How severe is CVE-2020-3923?

CVE-2020-3923 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-3923 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-3923?

CVE-2020-3923 primarily affects Tonnet Tat-77104g1 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-3923?

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-2020-3923 published?

CVE-2020-3923 was published on 2020-02-27 and last updated on 2026-06-17.

CVE-2020-3923

CVE-2020-3923 is a high-severity vulnerability in Tonnet Tat-77104g1 Firmware with a CVSS 3.x base score of 8.1. 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 10.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Tonnet Tat-77104g1 Firmware
Published: 2020-02-27
Last modified: 2026-06-17

Description

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contain misconfigured authentication mechanism. Attackers can crack the default password and gain access to the system.

Frequently asked questions

What is CVE-2020-3923?: DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contain misconfigured authentication mechanism. Attackers can crack the default password and gain access to the system.
How severe is CVE-2020-3923?: CVE-2020-3923 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-3923 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-3923?: CVE-2020-3923 primarily affects Tonnet Tat-77104g1 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-3923?: 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-2020-3923 published?: CVE-2020-3923 was published on 2020-02-27 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:tonnet:tat-77104g1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-70432n_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-71416g1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-71832g1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-76104g3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-76108g3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-76116g3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:tonnet:tat-76132g3_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tonnet Tat-77104g1 Firmware

CVE-2020-3924 — Medium (CVSS 6.4): DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET do not properly verify patch files. Attackers…

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CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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