EUVD-2026-29167CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/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
Lifecycle Timeline
5DescriptionNVD
Neat VNC is a VNC server library. Prior to 0.9.6, a pre-authentication stack buffer overflow exists in neatvnc in the RSA-AES security type handler. An unauthenticated remote attacker who can reach the VNC listening socket can send a crafted security type 5 (RSA-AES) or security type 129 (RSA-AES-256) handshake with an oversized client RSA public key, causing rsa_aes_send_challenge in src/auth/rsa-aes.c to overflow a 1024-byte on-stack buffer when encrypting the server challenge. This results in at least a denial of service via server crash. This vulnerability is fixed in 0.9.6.
AnalysisAI
Remote code execution and denial of service in Neat VNC library version <0.9.6 allows unauthenticated network attackers to overflow a 1024-byte stack buffer during RSA-AES security handshake. An attacker sends a crafted VNC security type 5 or 129 message with an oversized client RSA public key, triggering a stack buffer overflow in rsa_aes_send_challenge() when the server encrypts its challenge response. …
Sign in for full analysis, threat intelligence, and remediation guidance.
RemediationAI
Within 24 hours: Identify all systems running Neat VNC library versions <0.9.6 using dependency scanning and network asset inventory. Within 7 days: Contact your VNC vendor for patched versions and test updates in non-production environments; apply to version 0.9.6 or later as available. …
Sign in for detailed remediation steps.
Vendor StatusVendor
Share
External POC / Exploit Code
Leaving vuln.today