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Fencer Vulns
medium 5.3

CVE-2019-16516 json

An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185.

published 2020-01-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-7193

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
19.6%
EPSS 19.6% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

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.

Timeline

  1. Published
  2. First public exploit (EDB-50618)

Exploit prediction

19.60% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-50618 ConnectWise Control 19.2.24707 - Username Enumeration remote, 2022-01-05
  • know.bishopfox.com https://know.bishopfox.com/advisories/connectwise-control referenced PoC, tagged "exploit" by a source, unverified
  • blog.huntresslabs.com https://blog.huntresslabs.com/validating-the-bishop-fox-findings-in-connectwise-control-9155eec36a34 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/165432/ConnectWise-Control-19.2.24707-Username-Enumeration.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.