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neatvnc

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.

CVE-2026-42859 is a classic buffer overflow vulnerability (CWE-120) in neatvnc before version 0.9.6. It occurs in the rsa_aes_send_challenge function within the RSA-AES security type handler when processing a client handshake containing an oversized RSA public key. This overflow affects a 1024-byte on-stack buffer, enabling an unauthenticated remote attacker who can connect to the VNC listening socket to cause a denial of service by crashing the server. The issue is resolved in neatvnc 0.9.6.

Detailed information about CVE-2026-42859: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in any1 neatvnc affecting any1 neatvn

CVE-2026-42859: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in any1 neatvnc - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-42859: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in any1 neatvnc

server.c in Neat VNC (aka neatvnc) before 0.8.1 does not properly validate the security type, a related issue to CVE-2006-2369.

CVE-2024-42458 is a critical security vulnerability found in the Neat VNC server software, specifically in versions prior to 0.8.1. The root cause is improper validation of the security type parameter in the server.c component during the initial handshake with clients. This vulnerability is a variant of a previously known issue (CVE-2006-2369) that also involved inadequate validation of security types in VNC implementations. Because the security type negotiation is fundamental to establishing a secure session, failure to validate it properly can allow an attacker to bypass authentication mechanisms or trigger memory corruption. The vulnerability is remotely exploitable over the network without requiring any privileges or user interaction, making it highly accessible to attackers. Exploitation could lead to full compromise of the affected server, including arbitrary code execution, data disclosure, or denial of service. The CVSS v3.1 base score of 9.8 reflects the critical nature of this flaw, with attack vector being network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the similarity to a longstanding vulnerability and the critical score suggest that exploitation could be straightforward once a proof of concept is developed. The lack of an official patch at the time of publication means affected organizations must rely on interim mitigations. The CWE-20 classification indicates improper input validation as the underlying weakness. Given the widespread use of VNC for remote desktop access in various sectors, this vulnerability poses a significant threat to network security and operational continuity.

Detailed information about CVE-2024-42458: n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2024-42458: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2024-42458: n/a


CVE-2026-42859: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in any1 neatvncCVE-2026-42859 0 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. HighVulnerability#cve #cve-2026-42859 #cwe-120 Join the discussion	CVE Database V5	05/11/2026, 17:36:08 UTC Added: 05/11/2026, 18:06:27 UTC
CVE-2024-42458: n/aCVE-2024-42458 0 server.c in Neat VNC (aka neatvnc) before 0.8.1 does not properly validate the security type, a related issue to CVE-2006-2369. CriticalVulnerabilityUnited StatesGermanyUnited Kingdom+8#cve #cve-2024-42458 Join the discussion	CVE Database V5	08/02/2024, 00:00:00 UTC Added: 02/25/2026, 21:42:24 UTC

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