CVE-2021-4467 HIGH

CVE-2021-4467: Positive Technologies MaxPatrol 8 & XSpider Remote DoS

Vendor Positive Technologies
Product MaxPatrol 8 (Server)
Weakness CWE-400
Published November 14, 2025
Last update November 18, 2025

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Positive Technologies MaxPatrol 8 and XSpider contain a remote denial-of-service vulnerability in the client communication service on TCP port 2002. The service generates a new session identifier for each incoming connection without adequately limiting concurrent requests. An unauthenticated remote attacker can repeatedly issue HTTPS requests to the service, causing excessive allocation of session identifiers. Under load, session identifier collisions may occur, forcing active client sessions to disconnect and resulting in service disruption.

Key dates

02Disclosure timeline

November 14, 2025 CVE published
November 18, 2025 Record updated