Description
FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. Three PDU writers in libfreerdp/core/info.c (rdp_write_logon_info_v2, rdp_write_logon_info_plain, and rdp_write_logon_info_ex) use Stream_Seek instead of Stream_Zero for reserved pad bytes (up to 576 bytes), leaving previously freed heap contents in the outgoing PDU. Because the send buffer is allocated with malloc (not zeroed), stale heap data — which may include cleartext credentials from prior sessions — can be sent to the receiving peer. FreeRDP-based servers using rdpUpdate::SaveSessionInfo and freerdp-proxy (which forwards these PDUs) are affected, allowing disclosure of server/proxy process memory to a downstream client.
Affected products
freerdp: freerdp
References8
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v649-94v2-p… ExploitMitigationVendor Advisory
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v649-94v2-p… ExploitMitigationVendor Advisory
- github.com/FreeRDP/FreeRDP/commit/056cede398d71c1f2540baebc26ec… Patch
- github.com/FreeRDP/FreeRDP/commit/483c9388119f06bac420d92053cff… Patch
- www.vulncheck.com/advisories/freerdp-before-3.31.0-information-… PatchRelease NotesThird Party Advisory
- github.com/FreeRDP/FreeRDP Product
- github.com/FreeRDP/FreeRDP/blob/3.30.0/libfreerdp/core/info.c#L… Product
- github.com/FreeRDP/FreeRDP/releases/tag/3.31.0 ProductRelease Notes
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 4.0
-
7.1
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 32 · as of 3 November 2026
- CWE
- CWE-908
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