What’s Vulnerable › Vulnerabilities

CVE-2021-36798

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-09 · updated 2026-06-17
• Weakness: CWE-770

Description

A Denial-of-Service (DoS) vulnerability was discovered in Team Server in HelpSystems Cobalt Strike 4.2 and 4.3. It allows remote attackers to crash the C2 server thread and block beacons' communication with it.

Affected products

• Helpsystems Cobalt Strike: 4.2, 4.3

References

• https://labs.sentinelone.com/hotcobalt-new-cobalt-strike-dos-vulnerability-that-lets-you-halt-operations/
• https://www.cobaltstrike.com/releasenotes.txt
• https://labs.sentinelone.com/hotcobalt-new-cobalt-strike-dos-vulnerability-that-lets-you-halt-operations/
• https://www.cobaltstrike.com/releasenotes.txt

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