HOMEVULNERABILITIESCVE-2019-16517
CRITICAL

CVE-2019-16517

CWE-346Published: January 23, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. There is a CORS misconfiguration, which reflected the Origin provided by incoming requests. This allowed JavaScript running on any domain to interact with the server APIs and perform administrative actions, without the victim's knowledge.

NVD Source

Technical Analysis

CVE-2019-16517 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

connectwise1 product(s)
control
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://blog.huntresslabs.com/validating-the-bishop-fox-findings-in-connectwise-control-9155eec36a34
ADVISORYhttps://know.bishopfox.com/advisories
ADVISORYhttps://know.bishopfox.com/advisories/connectwise-control
ADVISORYhttps://www.crn.com/news/managed-services/connectwise-control-msp-security-vulnerabilities-are-severe-bishop-fox
ADVISORYhttps://www.crn.com/slide-shows/managed-services/connectwise-control-attack-chain-exploit-20-questions-for-security-researcher-bishop-fox
ADVISORYhttps://blog.huntresslabs.com/validating-the-bishop-fox-findings-in-connectwise-control-9155eec36a34
ADVISORYhttps://know.bishopfox.com/advisories
ADVISORYhttps://know.bishopfox.com/advisories/connectwise-control
ADVISORYhttps://www.crn.com/news/managed-services/connectwise-control-msp-security-vulnerabilities-are-severe-bishop-fox
ADVISORYhttps://www.crn.com/slide-shows/managed-services/connectwise-control-attack-chain-exploit-20-questions-for-security-researcher-bishop-fox

All References (10)

→
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
→
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

Quick Facts

CVE IDCVE-2019-16517
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-346
CISA KEVNo
Affected1 vendor(s)
PublishedJan 23, 2020

Related CVEs (CWE-346)

CVE-2026-42901
10.0
CVE-2023-30856
10.0
CVE-2024-25124
9.8
CVE-2020-26527
9.8
CVE-2022-23764
9.8
CVE-2018-15723
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-16517 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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