CVE-2022-39318— Division by zero in urbdrc channel in FreeRDP
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I. Basic Information for CVE-2022-39318
Vulnerability Information
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Vulnerability Title
Division by zero in urbdrc channel in FreeRDP
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free remote desktop protocol library and clients. Affected versions of FreeRDP are missing input validation in `urbdrc` channel. A malicious server can trick a FreeRDP based client to crash with division by zero. This issue has been addressed in version 2.9.0. All users are advised to upgrade. Users unable to upgrade should not use the `/usb` redirection switch.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRDP 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP存在安全漏洞，该漏洞源于“urbdrc”通道中缺少输入验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2022-39318
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- https://security.gentoo.org/glsa/202401-16vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2022-39318
Same Patch Batch · FreeRDP · 2022-11-16 · 7 CVEs total
| CVE-2022-39320 | 5.5 MEDIUM | Heap buffer overflow in urbdrc channel |
| CVE-2022-39316 | 4.8 MEDIUM | Out of bound read in FreeRDP |
| CVE-2022-39317 | 4.6 MEDIUM | Out of bounds read in zgfx decoder in FreeRDP |
| CVE-2022-39319 | 4.6 MEDIUM | Missing length validation in urbdrc channel in FreeRDP |
| CVE-2022-41877 | 4.6 MEDIUM | Missing input length validation in `drive` channel in FreeRDP |
| CVE-2022-39347 | 2.6 LOW | Missing path sanitation with `drive` channel in FreeRDP |
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same vendor: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same weakness: CWE-20
V. Comments for CVE-2022-39318
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