CRITICAL
CVE-2020-21237
CWE-307Published: December 27, 2021· Updated: Jun 17, 2026
9.8
CVSS v3.1
Official Description
An issue in the user login box of LJCMS v1.11 allows attackers to hijack user accounts via brute force attacks.
Technical Analysis
CVE-2020-21237 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
8cms1 product(s)
ljcms
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
All References (2)
→
https://github.com/wind-cyber/LJCMS-UserTraversal-VulnerabilityExploit · Third Party Advisory
→
https://github.com/wind-cyber/LJCMS-UserTraversal-VulnerabilityExploit · Third Party Advisory
Quick Facts
CVE IDCVE-2020-21237
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-307
CISA KEVNo
Affected1 vendor(s)
PublishedDec 27, 2021
Related CVEs (CWE-307)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-21237 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.