High severity7.5NVD Advisory· Published Aug 9, 2021· Updated Jun 17, 2026
CVE-2021-36798
CVE-2021-36798
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.
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Affected products
2- HelpSystems/Cobalt Strikedescription
- Range: 4.2, 4.3
Patches
Vulnerability mechanics
References
2- labs.sentinelone.com/hotcobalt-new-cobalt-strike-dos-vulnerability-that-lets-you-halt-operations/nvdExploitThird Party Advisory
- www.cobaltstrike.com/releasenotes.txtnvdRelease NotesVendor Advisory
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