CVE-2020-15103— Integer Overflow in FreeRDP
Quick assessment
Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 2.1.2及之前版本中存在输入验证错误漏洞。该漏洞源于网络系统或产品未对输入的数据进行正确的验证。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-15103
Vulnerability Information
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Vulnerability Title
Integer Overflow in FreeRDP
Source: CVE Program / CVE List V5
Vulnerability Description
In FreeRDP less than or equal to 2.1.2, an integer overflow exists due to missing input sanitation in rdpegfx channel. All FreeRDP clients are affected. The input rectangles from the server are not checked against local surface coordinates and blindly accepted. A malicious server can send data that will crash the client later on (invalid length arguments to a `memcpy`) This has been fixed in 2.2.0. As a workaround, stop using command line arguments /gfx, /gfx-h264 and /network:auto
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出导致缓冲区溢出
Source: CVE Program / CVE List V5
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 2.1.2及之前版本中存在输入验证错误漏洞。该漏洞源于网络系统或产品未对输入的数据进行正确的验证。
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-2020-15103
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2020-15103 (1)
Vendor Advisories for CVE-2020-15103 (2)
-
https://usn.ubuntu.com/4481-1/ vendor-advisory
Mailing List Discussions for CVE-2020-15103 (4)
Other References for CVE-2020-15103 (1)
IV. Related Vulnerabilities
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CVE-2026-63633
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CVE-2026-55194
FreeRDPHeap-buffer-overflow write in TS Gateway RPC RESPONSE
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CVE-2026-63633
FreeRDP: Heap buffer overflow in Opus audio decode (`freerdp -
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FreeRDP: Double-free of `client_formats` in the rdpsnd serve -
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FreeRDP: Denial of service through ADPCM frame size calculat -
CVE-2026-55192
FreeRDP: Out-of-bounds read in H.264 YUV-to-RGB conversion d -
CVE-2026-55194
FreeRDPHeap-buffer-overflow write in TS Gateway RPC RESPONSE
Same weakness: CWE-680
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V. Comments for CVE-2020-15103
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