MEDIUM
CVE-2021-3256
CWE-88Published: June 11, 2021· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
KuaiFanCMS V5.x contains an arbitrary file read vulnerability in the html_url parameter of the chakanhtml.module.php file.
Technical Analysis
CVE-2021-3256 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
kuaifan1 product(s)
kuaifancms
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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GitHub PoC Search
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Rapid7 / Metasploit
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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/poropro/kuaifan/issues/3Exploit · Issue Tracking · Third Party Advisory
→
https://github.com/poropro/kuaifan/issues/3Exploit · Issue Tracking · Third Party Advisory
Quick Facts
CVE IDCVE-2021-3256
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-88
CISA KEVNo
Affected1 vendor(s)
PublishedJun 11, 2021
Related CVEs (CWE-88)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-3256 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. CVE data is provided under the NVD usage policy.