What’s Vulnerable › Vulnerabilities

CVE-2021-37594

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-30 · updated 2026-06-17
• Weakness: CWE-20

Description

In FreeRDP before 2.4.0 on Windows, wf_cliprdr_server_file_contents_request in client/Windows/wf_cliprdr.c has missing input checks for a FILECONTENTS_SIZE File Contents Request PDU.

Affected products

• FreeRDP: before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: FreeRDP 2.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9
• https://github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0
• https://github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9
• https://github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0

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