CVE-2026-91951CWE-617

CVE-2026-91951

Medium · published September 15, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
30.9
In the wild
Unconfirmed
What it is

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trigger a 4-byte write past the allocated 16-byte buffer, causing denial of service when verbose asserts are enabled.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00380 · 30.9th percentile
Weakness
CWE-617 · Reachable Assertion
Published
2026-09-15T20:17Z
Affected products (1)
ProductVersionsFixed in
freerdp/freerdp≥ 3.14.0, < 3.31.03.31.0
References (2)
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h5w2-q35j-443h · [email protected]https://www.vulncheck.com/advisories/freerdp-3.14.0-through-3.30.0-out-of-bounds-write-via-urbdrc · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc
    cvelistv5