What’s Vulnerable › Vulnerabilities
CVE-2021-4467: Positive Technologies MaxPatrol 8 & XSpider Remote DoS
- Severity: high (CVSS 8.7 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-11-14 · updated 2026-06-17
- Weakness: CWE-400
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
- Positive Technologies MaxPatrol 8 (Server): through 09.2020
- Positive Technologies XSpider (Server): through 09.2020
References
- https://cxsecurity.com/issue/WLB-2021090114
- https://vulners.com/zdt/1337DAY-ID-36775
- https://www.ptsecurity.com/
- https://www.vulncheck.com/advisories/positive-technologies-maxpatrol-8-and-xspider-remote-dos
- https://cxsecurity.com/issue/WLB-2021090114
- https://vulners.com/zdt/1337DAY-ID-36775
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