How severe is CVE-2021-33021?

CVE-2021-33021 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-33021 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-2021-33021?

CVE-2021-33021 affects Xarrow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33021?

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

When was CVE-2021-33021 published?

CVE-2021-33021 was published on 2022-05-16 and last updated on 2026-06-17.

CVE-2021-33021

CVE-2021-33021 is a medium-severity vulnerability in Xarrow with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Xarrow
Published: 2022-05-16
Last modified: 2026-06-17

Description

xArrow SCADA versions 7.2 and prior is vulnerable to cross-site scripting due to parameter ‘edate’ of the resource xhisalarm.htm, which may allow an unauthorized attacker to execute arbitrary code.

Frequently asked questions

What is CVE-2021-33021?: xArrow SCADA versions 7.2 and prior is vulnerable to cross-site scripting due to parameter ‘edate’ of the resource xhisalarm.htm, which may allow an unauthorized attacker to execute arbitrary code.
How severe is CVE-2021-33021?: CVE-2021-33021 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-33021 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-2021-33021?: CVE-2021-33021 affects Xarrow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-33021 published?: CVE-2021-33021 was published on 2022-05-16 and last updated on 2026-06-17.

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-229-03

Affected products (1)

cpe:2.3:a:xarrow:xarrow:*:*:*:*:*:*:*:*

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