How severe is CVE-2019-16516?

CVE-2019-16516 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2019-16516 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16516?

CVE-2019-16516 primarily affects Connectwise Control. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-16516?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-16516 published?

CVE-2019-16516 was published on 2020-01-23 and last updated on 2026-06-17.

CVE-2019-16516

CVE-2019-16516 is a medium-severity vulnerability in Connectwise Control with a CVSS 3.x base score of 5.3. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-203.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Connectwise Control
Published: 2020-01-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-16516?: CVE-2019-16516 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2019-16516 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16516?: CVE-2019-16516 primarily affects Connectwise Control. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-16516?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-16516 published?: CVE-2019-16516 was published on 2020-01-23 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:connectwise:control:*:*:*:*:*:*:*:*
cpe:2.3:a:connectwise:control:19.3.25270.7185:*:*:*:*:*:*:*

More vulnerabilities in Connectwise Control

CVE-2023-25718 — Critical (CVSS 9.8): In ConnectWise Control through 22.9.10032 (formerly known as ScreenConnect), after an executable file is signed,…
CVE-2019-16517 — Critical (CVSS 9.8): An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. There is a CORS…
CVE-2023-25719 — High (CVSS 8.8): ConnectWise Control before 22.9.10032 (formerly known as ScreenConnect) fails to validate user-supplied parameters such…
CVE-2019-16513 — High (CVSS 8.8): An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. CSRF can be used to…
CVE-2019-16514 — High (CVSS 7.2): An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. The server allows…
CVE-2019-16515 — Medium (CVSS 6.5): An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. Certain HTTP security…

All CVEs affecting Connectwise Control →

Other CWE-203 (Observable Discrepancy) vulnerabilities

CVE-2019-25337 — Critical (CVSS 9.8): OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by…
CVE-2026-23519 — Critical (CVSS 9.8): RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in…
CVE-2025-27667 — Critical (CVSS 9.8): Vasion Print (formerly PrinterLogic) before Virtual Appliance Host 22.0.843 Application 20.0.1923 allows Administrative…
CVE-2024-25714 — Critical (CVSS 9.8): In Rhonabwy through 1.1.13, HMAC signature verification uses a strcmp function that is vulnerable to side-channel…
CVE-2024-25191 — Critical (CVSS 9.8): php-jwt 1.0.0 uses strcmp (which is not constant time) to verify authentication, which makes it easier to bypass…
CVE-2024-25190 — Critical (CVSS 9.8): l8w8jwt 2.2.1 uses memcmp (which is not constant time) to verify authentication, which makes it easier to bypass…

Browse all CWE-203 (Observable Discrepancy) vulnerabilities →