Service interruption via short UVC descriptor overread
Published Aug 1, 2026 · Updated Aug 1, 2026
Out-of-bounds read in FreeRDP before 3.29.0 allows physically proximate attackers to interrupt a Linux RDP client with a malicious USB camera. The rdpecam V4L descriptor walker checks only type and subtype before memcmp reads a 16-byte GUID from a four-byte extension-unit descriptor. The victim must select the attached camera for redirection; the demonstrated effect is an out-of-bounds read that aborts sanitizer builds and can crash the client.
Summary
What happened
Out-of-bounds read in FreeRDP before 3.29.0 allows physically proximate attackers to interrupt a Linux RDP client with a malicious USB camera. The rdpecam V4L descriptor walker checks only type and subtype before memcmp reads a 16-byte GUID from a four-byte extension-unit descriptor. The victim must select the attached camera for redirection; the demonstrated effect is an out-of-bounds read that aborts sanitizer builds and can crash the client.
The record
- CVE
- CVE-2026-66401
- Published
- Aug 1, 2026
- Updated
- Aug 1, 2026
- Vendor
- FreeRDP
- Product
- FreeRDP
- Classifications
- CWE-125, T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 1, 2026CVE publishedPublication date reported by the CVE source.
- Aug 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.29.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- INT-usb-freerdp-uvc-xu-short-extra-oob.zipproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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