CVE-2021-4467 - CVE House
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Status published High CVE-2021-4467

Positive Technologies MaxPatrol 8 & XSpider Remote DoS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • AsCiI

Affected Vendor

Positive Technologies

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Affected Software

MaxPatrol 8 (Server), XSpider (Server)
Vulnerable Versions:
0

Timeline

Official Publish: November 14th, 2025
Last Modified: November 18th, 2025
Added to House: July 21st, 2026

CVSS Vectors

Weaknesses (CWE)