Security readout for executives and security teams
Plain-English summary
CVE-2021-41809 is a low-severity server-side request forgery issue in M-Files Server before 22.1.11017.1. A preview function could cause the server to make outbound requests when handling certain document types that reference external entities. Business impact appears limited to possible low confidentiality exposure, with privileges and user interaction required.
Executive priority
Treat this as routine patching unless M-Files handles sensitive documents or untrusted uploads. Prioritize affected servers in environments with restricted internal services, because SSRF can sometimes reach systems users cannot access directly.
Technical view
The vulnerability is CWE-918 SSRF in an M-Files Server preview function. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N, scoring 3.5. Sources identify versions before 22.1.11017.1 as affected. No source in the bundle reports integrity or availability impact.
Likely exposure
Exposure is most likely where M-Files Server versions before 22.1.11017.1 are deployed and preview workflows process document types capable of referencing external entities. The bundle does not provide enough detail to assess internet-facing exposure or specific deployment configurations.
Exploitation context
The source bundle does not indicate known active exploitation, and the CVE is not marked as KEV. Exploitation requires low privileges and user interaction, according to CVSS. The known impact is limited confidentiality exposure from server-originated requests.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, and vendor references. Do not assume broader product impact, public exploit availability, or specific bypass techniques. Focus review on preview processing, external entity handling, and outbound request controls.
Mitigation direction
- Upgrade M-Files Server to 22.1.11017.1 or later, following vendor guidance.
- Review the M-Files advisory for supported remediation details.
- Limit unnecessary access to document preview features for untrusted users.
- Monitor and restrict unexpected outbound traffic from M-Files Server where feasible.
Validation and detection
- Inventory M-Files Server versions and identify instances before 22.1.11017.1.
- Confirm whether preview workflows handle document types referencing external entities.
- Review server and proxy logs for unusual outbound requests from M-Files Server.
- Verify remediation by confirming the updated M-Files Server version.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-41809 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N2.11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.m-files.com/about/trust-center/security-vulnerabilities/cve-2021-41809/CVE reference · x_refsource_MISC
- https://empower.m-files.com/security-advisories/CVE-2021-41809CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.