CVE-2020-11038— Integer Overflow to Buffer Overflow in FreeRDP
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I. Basic Information for CVE-2020-11038
Vulnerability Information
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Vulnerability Title
Integer Overflow to Buffer Overflow in FreeRDP
Source: NVD (National Vulnerability Database)
Vulnerability Description
In FreeRDP less than or equal to 2.0.0, an Integer Overflow to Buffer Overflow exists. When using /video redirection, a manipulated server can instruct the client to allocate a buffer with a smaller size than requested due to an integer overflow in size calculation. With later messages, the server can manipulate the client to write data out of bound to the previously allocated buffer. This has been patched in 2.1.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出导致缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeRDP 输入验证错误漏洞
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 2.0.0及之前版本中存在安全漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
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-2020-11038
| # | POC Description | Source Link | Shenlong Link |
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Same Patch Batch · FreeRDP · 2020-05-29 · 13 CVEs total
| CVE-2020-11039 | 8.0 HIGH | Integer Overflow in FreeRDP |
| CVE-2020-11017 | 6.5 MEDIUM | Double free in cliprdr_server_receive_capabilities in FreeRDP |
| CVE-2020-11018 | 6.5 MEDIUM | Out of bound read in cliprdr_server_receive_capabilities in FreeRDP |
| CVE-2020-11019 | 4.3 MEDIUM | Out of bound read in update_recv in FreeRDP |
| CVE-2020-11089 | 3.7 LOW | Out-of-bound read in FreeRDP |
| CVE-2020-11086 | 3.1 LOW | Out-of-bounds Read in FreeRDP `ntlm_read_ntlm_v2_response` |
| CVE-2020-11087 | 3.1 LOW | Out-of-bounds Read in FreeRDP |
| CVE-2020-11088 | 3.1 LOW | Out-of-bound read in FreeRDP |
| CVE-2020-11085 | 2.6 LOW | Out-of-bounds Read in FreeRDP |
| CVE-2020-11040 | 2.2 LOW | Out-of-bounds Read in FreeRDP |
| CVE-2020-11041 | 2.2 LOW | Improper Validation of Array Index in FreeRDP |
| CVE-2020-11043 | 2.2 LOW | Out-of-bounds Read 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
V. Comments for CVE-2020-11038
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