Resource exhaustion in Helpsystems Cobalt Strike
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.043 (90.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000
Affected products
- Helpsystems Cobalt Strike — versions 4.2, 4.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.cobaltstrike.com/releasenotes.txt (Release Notes, Vendor Advisory)
- labs.sentinelone.com/hotcobalt-new-cobalt-strike-dos-vulnerability-that-lets-yo… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-36798?
- CVE-2021-36798 is a high-severity vulnerability in Helpsystems Cobalt Strike, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2021-08-09.
- How severe is CVE-2021-36798?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-36798 known to be exploited?
- 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.