A Denial-of-Service (DoS) vulnerability was discovered in Team Server in HelpSystems…
Priority MEDIUM 40CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
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.
Why it matters now
EPSS 0.04292 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:helpsystems:cobalt_strike:4.2:*:*:*:*:*:*:* | 4.2 | Vulnerable | Helpsystems |
| cpe:2.3:a:helpsystems:cobalt_strike:4.3:*:*:*:*:*:*:* | 4.3 | Vulnerable | Helpsystems |
- cpe:2.3:a:helpsystems:cobalt_strike:4.2:*:*:*:*:*:*:* Versions 4.2 Vulnerable ·Helpsystems
- cpe:2.3:a:helpsystems:cobalt_strike:4.3:*:*:*:*:*:*:* Versions 4.3 Vulnerable ·Helpsystems
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36798
- 2026-10-03 Alias added: GHSA-6vhg-vrw5-pm3f
References
More Helpsystems Cobalt Strike vulnerabilities
- TI-2022-20934 Cobalt Strike 4.7.1 fails to properly escape HTML tags when they are displayed on Swing… KEVCVSS 3.1CRITICAL 9.8
- TI-2022-18577 An XSS (Cross Site Scripting) vulnerability was found in HelpSystems Cobalt Strike… KEVCVSS 3.1MEDIUM 6.1
- TI-2022-07435 CobaltStrike <=4.5 HTTP(S) listener does not determine whether the request URL begins… CVSS 3.1HIGH 7.5
Sources
- CVE-2021-36798 · CVE Program
- CVE-2021-36798 · NVD
- FIRST EPSS
- GHSA-6vhg-vrw5-pm3f · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences