ConnectWise ScreenConnect auth bypass mass-exploited
ConnectWise ScreenConnect
ConnectWise ScreenConnect before 23.9.8 had a trivially exploitable authentication bypass (CVE-2024-1709, CVSS 10) and a path traversal (CVE-2024-1708), reported to ConnectWise on 2024-02-19. Attackers could create an admin account on self-hosted servers and then push code to every managed endpoint. Exploitation began within days, including by ransomware groups. Cloud instances were patched by ConnectWise; on-premise servers had to update to 23.9.8. Added to the CISA KEV catalog on 2024-02-22. CISA lists known use in ransomware campaigns.
Why this severity: CVSS 10 (v3.1, CNA), actively exploited (CISA KEV); known ransomware use
- Started
- Feb 19, 2024
- Closed
- Feb 22, 2024
Affected
- ScreenConnect 23.9.7 and earlier (ConnectWise bulletin)
Fixed in
- 23.9.8 (ConnectWise bulletin)
Updates by day5
Advisories4
Notes & caveats
Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).
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