How severe is CVE-2021-40091?

CVE-2021-40091 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40091?

CVE-2021-40091 primarily affects Squaredup. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-40091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-40091 published?

CVE-2021-40091 was published on 2021-12-06 and last updated on 2026-06-17.

CVE-2021-40091

CVE-2021-40091 is a critical-severity vulnerability in Squaredup with a CVSS 3.x base score of 9.8. 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-918.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Squaredup
Published: 2021-12-06
Last modified: 2026-06-17

Description

An SSRF issue was discovered in SquaredUp for SCOM 5.2.1.6654.

Frequently asked questions

What is CVE-2021-40091?: An SSRF issue was discovered in SquaredUp for SCOM 5.2.1.6654.
How severe is CVE-2021-40091?: CVE-2021-40091 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40091?: CVE-2021-40091 primarily affects Squaredup. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-40091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-40091 published?: CVE-2021-40091 was published on 2021-12-06 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:squaredup:squaredup:*:*:*:*:azure:*:*:*
cpe:2.3:a:squaredup:squaredup:*:*:*:*:community:*:*:*
cpe:2.3:a:squaredup:squaredup:*:*:*:*:system_center_operations_manager:*:*:*

More vulnerabilities in Squaredup

CVE-2020-9388 — Medium (CVSS 6.5): CSRF protection was not present in SquaredUp before version 4.6.0. A CSRF attack could have been possible by an…
CVE-2021-40096 — Medium (CVSS 5.4): A cross-site scripting (XSS) vulnerability in integration configuration in SquaredUp for SCOM 5.2.1.6654 allows remote…
CVE-2021-40094 — Medium (CVSS 5.4): A DOM-based XSS vulnerability affects SquaredUp for SCOM 5.2.1.6654. If successfully exploited, this vulnerability may…
CVE-2021-40093 — Medium (CVSS 5.4): A cross-site scripting (XSS) vulnerability in integration configuration in SquaredUp for SCOM 5.2.1.6654 allows remote…
CVE-2021-40092 — Medium (CVSS 5.4): A cross-site scripting (XSS) vulnerability in Image Tile in SquaredUp for SCOM 5.2.1.6654 allows remote attackers to…
CVE-2020-9390 — Medium (CVSS 5.4): SquaredUp allowed Stored XSS before version 4.6.0. A user was able to create a dashboard that executed malicious…

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