How severe is CVE-2020-21406?

CVE-2020-21406 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-21406 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-21406?

CVE-2020-21406 primarily affects V88 Smart Tv Box Project V88 Smart Tv Box Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-21406?

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-2020-21406 published?

CVE-2020-21406 was published on 2022-07-20 and last updated on 2026-06-17.

CVE-2020-21406

CVE-2020-21406 is a high-severity vulnerability in V88 Smart Tv Box Project V88 Smart Tv Box Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: V88 Smart Tv Box Project V88 Smart Tv Box Firmware
Published: 2022-07-20
Last modified: 2026-06-17

Description

An issue was discovered in RK Smart TV Box MAX and V88 SmartTV box that allows attackers to cause a denial of service via the switchNextDisplayInterface service.

Frequently asked questions

What is CVE-2020-21406?: An issue was discovered in RK Smart TV Box MAX and V88 SmartTV box that allows attackers to cause a denial of service via the switchNextDisplayInterface service.
How severe is CVE-2020-21406?: CVE-2020-21406 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-21406 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-21406?: CVE-2020-21406 primarily affects V88 Smart Tv Box Project V88 Smart Tv Box Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-21406?: 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-2020-21406 published?: CVE-2020-21406 was published on 2022-07-20 and last updated on 2026-06-17.

References

https://github.com/helloworldxp/TVBoxBugs/blob/master/RK_MAX_V88_SmartTV_Vulnerability

Affected products (2)

cpe:2.3:o:v88_smart_tv_box_project:v88_smart_tv_box_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:rk_max_smart_tv_box_project:rk_max_smart_tv_box_firmware:-:*:*:*:*:*:*:*