How severe is CVE-2021-43009?

CVE-2021-43009 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-2021-43009 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-2021-43009?

CVE-2021-43009 affects Opservices Opmon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43009?

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

When was CVE-2021-43009 published?

CVE-2021-43009 was published on 2022-04-08 and last updated on 2026-06-17.

CVE-2021-43009

CVE-2021-43009 is a medium-severity vulnerability in Opservices Opmon 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: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Opservices Opmon
Published: 2022-04-08
Last modified: 2026-06-17

Description

A Cross Site Scripting (XSS) vulnerability exists in OpServices OpMon through 9.11 via the search parameter in the request URL.

Frequently asked questions

What is CVE-2021-43009?: A Cross Site Scripting (XSS) vulnerability exists in OpServices OpMon through 9.11 via the search parameter in the request URL.
How severe is CVE-2021-43009?: CVE-2021-43009 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-2021-43009 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-2021-43009?: CVE-2021-43009 affects Opservices Opmon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43009?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43009 published?: CVE-2021-43009 was published on 2022-04-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opservices:opmon:*:*:*:*:*:*:*:*

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CVE-2020-8636 — Critical (CVSS 9.8): An issue was discovered in OpServices OpMon 9.3.2 that allows Remote Code Execution .
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