CVE-2021-4467

Positive Technologies MaxPatrol 8 & XSpider Remote DoS

HIGH
8.7
CVSS Score
Published: November 14, 2025 at 10:51 PM UTC
Updated: June 17, 2026 at 04:19 AM UTC
2 products affected across 1 vendorMaxPatrol 8XSpider

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 09.2020
v ≤ 09.2020

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-400

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