Vulnerability · Published Nov 14, 2025 · Assigned by VulnCheck
CVE-2021-4467Positive Technologies MaxPatrol 8 & XSpider Remote DoS
High 8.7
In plain English
A high-severity uncontrolled resource consumption in MaxPatrol 8 (Server) from Positive Technologies. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Positive Technologies | MaxPatrol 8 (Server) | 0 – through 09.2020 |
| Positive Technologies | XSpider (Server) | 0 – through 09.2020 |
Weakness: CWE-400 · 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