CVE-2021-37253

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.84% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 85.4% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-12-05 20:28Z4 YR AGO

Last updated

2024-08-04 01:16Z2 YR AGO

Reserved

2021-07-21

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base

Data version

5.1

Document digest

832ce5e6376c8397ef3a49cba67cd1bb535a10663e3334a9294cc06fb24fe986

• www.m-files.comhttps://www.m-files.com/company/trust-center/vulnerability-disclosure/x_refsource_MISC
• seclists.org20211203 CVE-2021-37253: M-Files Web Improper Range Header Processing Denial of Services (DoS) Vulnerabilityhttp://seclists.org/fulldisclosure/2021/Dec/1mailing-listx_refsource_FULLDISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/165139/M-Files-Web-Denial-Of-Service.htmlx_refsource_MISC
• www.tenable.comhttps://www.tenable.com/cve/CVE-2021-37253x_refsource_MISC
• vulmon.comhttps://vulmon.com/vulnerabilitydetails?qid=CVE-2021-37253x_refsource_MISC
• www.m-files.comhttps://www.m-files.com/about/trust-center/security-advisories/cve-2021-37253-denial-of-service/x_refsource_MISC