How severe is CVE-2021-37253?

CVE-2021-37253 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-37253 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37253?

CVE-2021-37253 affects M-files M-files Web. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-37253?

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-2021-37253 published?

CVE-2021-37253 was published on 2021-12-05 and last updated on 2026-06-17.

CVE-2021-37253

CVE-2021-37253 is a high-severity vulnerability in M-files M-files Web with a CVSS 3.x base score of 7.5. 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-444.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: M-files M-files Web
Published: 2021-12-05
Last modified: 2026-06-17

Description

M-Files Web before 20.10.9524.1 allows a denial of service via overlapping ranges (in HTTP requests with crafted Range or Request-Range headers). NOTE: this is disputed because the range behavior is the responsibility of the web server, not the responsibility of the individual web application

Frequently asked questions

What is CVE-2021-37253?: M-Files Web before 20.10.9524.1 allows a denial of service via overlapping ranges (in HTTP requests with crafted Range or Request-Range headers). NOTE: this is disputed because the range behavior is the responsibility of the web server, not the responsibility of the individual web application
How severe is CVE-2021-37253?: CVE-2021-37253 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-37253 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37253?: CVE-2021-37253 affects M-files M-files Web. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-37253?: 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-2021-37253 published?: CVE-2021-37253 was published on 2021-12-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:m-files:m-files_web:*:*:*:*:*:*:*:*

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