CVE-2021-36798
HIGHCVSS 7.5/10EPSS 4.29%
Last modified
CVE-2021-36798 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 4.29% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Helpsystems | Cobalt Strike | 4.2 |
| Helpsystems | Cobalt Strike | 4.3 |
References
- https://labs.sentinelone.com/hotcobalt-new-cobalt-strike-dos-vulnerability-that-lets-you-halt-operations/Exploit, Third Party Advisory
- https://www.cobaltstrike.com/releasenotes.txtRelease Notes, Vendor Advisory
- https://labs.sentinelone.com/hotcobalt-new-cobalt-strike-dos-vulnerability-that-lets-you-halt-operations/Exploit, Third Party Advisory
- https://www.cobaltstrike.com/releasenotes.txtRelease Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-36798?
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.
How severe is CVE-2021-36798?
CVE-2021-36798 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-36798?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-36798?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST