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

8.7HIGH

Key Information:

Vendor

Positive Technologies

Status
Maxpatrol 8 (server)
Xspider (server)
Vendor
CVE Published:
14 November 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-4467?

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 Version(s)

MaxPatrol 8 (Server) 0 <= 09.2020

XSpider (Server) 0 <= 09.2020

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-4467 - Proof of Concept

References

https://vulners.com/zdt/1337DAY-ID-36775
exploit
https://cxsecurity.com/issue/WLB-2021090114
exploit
https://www.ptsecurity.com/
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

AsCiI
JSON
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CVE-2021-4467 : Remote Denial-of-Service Vulnerability in Positive Technologies MaxPatrol 8 and XSpider