What is CVE-2021-37595?

CVE-2021-37595 is a critical-severity vulnerability in Freerdp, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-07-30.

How severe is CVE-2021-37595?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-37595 known to be exploited?

7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Freerdp

CVE-2021-37595

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_RANGE File Contents Request PDU.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-07-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9 (Patch, Third Party Advisory)
github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-37595?: CVE-2021-37595 is a critical-severity vulnerability in Freerdp, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-07-30.
How severe is CVE-2021-37595?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-37595 known to be exploited?: 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.