How severe is CVE-2021-36921?

CVE-2021-36921 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36921 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36921?

CVE-2021-36921 affects Monitorapp Application Insight Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36921?

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-2021-36921 published?

CVE-2021-36921 was published on 2021-08-12 and last updated on 2026-06-17.

CVE-2021-36921

CVE-2021-36921 is a high-severity vulnerability in Monitorapp Application Insight Manager with a CVSS 3.x base score of 8.8. 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-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Monitorapp Application Insight Manager
Published: 2021-08-12
Last modified: 2026-06-17

Description

AIMANAGER before B115 on MONITORAPP Application Insight Web Application Firewall (AIWAF) devices with Manager 2.1.0 has Improper Authentication. An attacker can gain administrative access by modifying the response to an authentication check request.

Frequently asked questions

What is CVE-2021-36921?: AIMANAGER before B115 on MONITORAPP Application Insight Web Application Firewall (AIWAF) devices with Manager 2.1.0 has Improper Authentication. An attacker can gain administrative access by modifying the response to an authentication check request.
How severe is CVE-2021-36921?: CVE-2021-36921 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36921 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36921?: CVE-2021-36921 affects Monitorapp Application Insight Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36921?: 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-2021-36921 published?: CVE-2021-36921 was published on 2021-08-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:monitorapp:application_insight_manager:*:*:*:*:*:*:*:*

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CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
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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