CVE-2019-16516

Name: CVE-2019-16516
Creator: NVD / NIST
Published: 2020-01-23T18:15:13.727+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 19.10%

Last modified Jun 17, 2026

CVE-2019-16516 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 19.10% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

19.10%

97.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Connectwise	Control	<= 19.2.24707
Connectwise	Control	19.3.25270.7185

References

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

Timeline

Published: Jan 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16516?

How severe is CVE-2019-16516?

CVE-2019-16516 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 19.10% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16516?

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.

Are you affected by CVE-2019-16516?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST