HOMEVULNERABILITIESCVE-2021-37594
CRITICAL

CVE-2021-37594

CWE-20Published: July 30, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-37594 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

FreeRDP1 product(s)
freerdp
Microsoft1 product(s)
windows
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9
PATCHhttps://github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9
ADVISORYhttps://github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0
ADVISORYhttps://github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0

All References (4)

→
https://github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9Patch · Third Party Advisory
→
https://github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0Release Notes · Third Party Advisory
→
https://github.com/FreeRDP/FreeRDP/commit/0d79670a28c0ab049af08613621aa0c267f977e9Patch · Third Party Advisory
→
https://github.com/FreeRDP/FreeRDP/compare/2.3.2...2.4.0Release Notes · Third Party Advisory

Quick Facts

CVE IDCVE-2021-37594
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-20
CISA KEVNo
Affected2 vendor(s)
PublishedJul 30, 2021

Related CVEs (CWE-20)

CVE-2002-2365
10.0
CVE-2002-1874
10.0
CVE-2002-1358
10.0
CVE-2002-2236
10.0
CVE-2002-1360
10.0
CVE-2003-1487
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-37594 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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