CVE-2026-64624

Client-side command execution via embedded CLI options

Published Jul 20, 2026 · Updated Jul 20, 2026

Argument injection in FreeRDP before 3.28.0 allows attackers to execute local commands by supplying a crafted RDP connection file. The connection-file parser appends slash-prefixed lines verbatim to an argument vector passed to freerdp_client_settings_parse_command_line, exposing options such as /rdp2tcp, /cert:ignore, and /drive. Opening the file is required; command execution also requires an rdp2tcp-enabled build, while certificate bypass and drive exposure affect every client build.

CVSS severity8.5
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Argument injection in FreeRDP before 3.28.0 allows attackers to execute local commands by supplying a crafted RDP connection file. The connection-file parser appends slash-prefixed lines verbatim to an argument vector passed to freerdp_client_settings_parse_command_line, exposing options such as /rdp2tcp, /cert:ignore, and /drive. Opening the file is required; command execution also requires an rdp2tcp-enabled build, while certificate bypass and drive exposure affect every client build.

The record

CVE
CVE-2026-64624
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-88, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.28.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=0 <3.28.0

Published CVSS scores

7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo