CVE-2021-4467

Positive Technologies MaxPatrol 8 & XSpider Remote DoS

Published Nov 14, 2025 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Positive Technologies maxpatrol8
CPEs cpe:2.3:a:positive_technologies:maxpatrol8:*:*:*:*:*:*:*:*
cpe:2.3:a:positive_technologies:xspider:*:*:*:*:*:*:*:*
Vendors & Products Positive Technologies maxpatrol8
Type Values Removed Values Added
First Time appeared Positive Technologies
Positive Technologies maxpatrol 8
Positive Technologies xspider
Vendors & Products Positive Technologies
Positive Technologies maxpatrol 8
Positive Technologies xspider
Type Values Removed Values Added
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.
Title Positive Technologies MaxPatrol 8 & XSpider Remote DoS
Weaknesses CWE-400
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 18, 2025, 4:33 PM
Reserved
Nov 14, 2025, 8:03 PM
Status
Deferred
Published
Nov 14, 2025, 11:15 PM
Modified
Jun 17, 2026, 4:19 AM