Vulnerability record/PUBLISHED/Published Nov 4, 2026 15:33:25 UTC
CVE-2026-121962
FreeRDP before 3.32.2 contains a heap buffer overflow in transport_default_read_pdu when handling partial Early User Authorization reads during PROTOCOL_HYBRID_EX CredSSP. A malicious RDP server can split the four-byte EUA result into short reads that advance the stream pointer beyond the 16 KiB allocation, causing an out-of-bounds write and client denial of service.
Base score7.2/ 10
SeverityHighCVSS 4.0
Exploitability / impact
CVSS metric breakdown
Base severityHigh
Attack vectorNetworkAV
Attack complexityLowAC
Attack requirementsNoneAT
Privileges requiredNonePR
User interactionPassiveUI
Vulnerable system confidentialityNoneVC
Vulnerable system integrityHighVI
Vulnerable system availabilityHighVA
Subsequent system confidentialityNoneSC
Subsequent system integrityNoneSI
Subsequent system availabilityNoneSA
CVSS vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:NCVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.
Record context
CVE Numbering AuthorityVulnCheck
Last updatedNov 4, 2026 18:24:32 UTC
PublishedNov 4, 2026 15:33:25 UTC
ReservedNov 4, 2026 12:48:39 UTC
Credits
- Kushalkhemka
- mayank-jangid-moon
- opensec-intelligence