CVE-2019-16516

An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. There is a user enumeration vulnerability, allowing an unauthenticated attacker to determine with certainty if an account exists for a given username.

• CWE-203

• http://packetstormsecurity.com/files/165432/ConnectWise-Control-19.2.24707-Username-Enumeration.htmlExploit, Third Party Advisory, VDB Entry
• https://blog.huntresslabs.com/validating-the-bishop-fox-findings-in-connectwise-control-9155eec36a34Exploit, Third Party Advisory
• https://know.bishopfox.com/advisoriesThird Party Advisory
• https://know.bishopfox.com/advisories/connectwise-controlExploit, Third Party Advisory
• https://www.crn.com/news/managed-services/connectwise-control-msp-security-vulnerabilities-are-severe-bishop-foxThird Party Advisory
• https://www.crn.com/slide-shows/managed-services/connectwise-control-attack-chain-exploit-20-questions-for-security-researcher-bishop-foxThird Party Advisory
• http://packetstormsecurity.com/files/165432/ConnectWise-Control-19.2.24707-Username-Enumeration.htmlExploit, Third Party Advisory, VDB Entry
• https://blog.huntresslabs.com/validating-the-bishop-fox-findings-in-connectwise-control-9155eec36a34Exploit, Third Party Advisory
• https://know.bishopfox.com/advisoriesThird Party Advisory
• https://know.bishopfox.com/advisories/connectwise-controlExploit, Third Party Advisory
• https://www.crn.com/news/managed-services/connectwise-control-msp-security-vulnerabilities-are-severe-bishop-foxThird Party Advisory
• https://www.crn.com/slide-shows/managed-services/connectwise-control-attack-chain-exploit-20-questions-for-security-researcher-bishop-foxThird Party Advisory

Published

Jan 23, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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