How severe is CVE-2021-42750?

CVE-2021-42750 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-42750 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42750?

CVE-2021-42750 affects Thingsboard. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42750?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42750 published?

CVE-2021-42750 was published on 2022-08-12 and last updated on 2026-06-17.

CVE-2021-42750

CVE-2021-42750 is a medium-severity vulnerability in Thingsboard with a CVSS 3.x base score of 4.8. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Thingsboard
Published: 2022-08-12
Last modified: 2026-06-17

Description

A cross-site scripting (XSS) vulnerability in Rule Engine in ThingsBoard 3.3.1 allows remote attackers (with administrative access) to inject arbitrary JavaScript within the title of a rule node.

Frequently asked questions

What is CVE-2021-42750?: A cross-site scripting (XSS) vulnerability in Rule Engine in ThingsBoard 3.3.1 allows remote attackers (with administrative access) to inject arbitrary JavaScript within the title of a rule node.
How severe is CVE-2021-42750?: CVE-2021-42750 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-42750 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42750?: CVE-2021-42750 affects Thingsboard. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42750?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42750 published?: CVE-2021-42750 was published on 2022-08-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:thingsboard:thingsboard:3.3.1:*:*:*:*:*:*:*

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