CRITICAL
CVE-2021-45490
CWE-295Published: March 28, 2022· Updated: Jun 17, 2026
9.1
CVSS v3.1
Official Description
The client applications in 3CX on Windows, the 3CX app for iOS, and the 3CX application for Android through 2022-03-17 lack SSL certificate validation.
Technical Analysis
CVE-2021-45490 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), with a CVSS base score of 9.1.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected Vendors & Products
3cx1 product(s)
3cx
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
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Official Patches & Advisories
All References (4)
→
https://packetstormsecurity.com/files/166376/3CX-Client-Missing-TLS-Validation.htmlThird Party Advisory · VDB Entry
→
https://www.3cx.com/community/forums/posts-articles-news/Vendor Advisory
→
https://packetstormsecurity.com/files/166376/3CX-Client-Missing-TLS-Validation.htmlThird Party Advisory · VDB Entry
→
https://www.3cx.com/community/forums/posts-articles-news/Vendor Advisory
Quick Facts
CVE IDCVE-2021-45490
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-295
CISA KEVNo
Affected1 vendor(s)
PublishedMar 28, 2022
Related CVEs (CWE-295)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-45490 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.