How severe is CVE-2021-3256?

CVE-2021-3256 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-3256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3256?

CVE-2021-3256 affects Kuaifan Kuaifancms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3256?

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

When was CVE-2021-3256 published?

CVE-2021-3256 was published on 2021-06-11 and last updated on 2026-06-17.

CVE-2021-3256

CVE-2021-3256 is a medium-severity vulnerability in Kuaifan Kuaifancms with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-88.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-88
Affected product: Kuaifan Kuaifancms
Published: 2021-06-11
Last modified: 2026-06-17

Description

KuaiFanCMS V5.x contains an arbitrary file read vulnerability in the html_url parameter of the chakanhtml.module.php file.

Frequently asked questions

What is CVE-2021-3256?: KuaiFanCMS V5.x contains an arbitrary file read vulnerability in the html_url parameter of the chakanhtml.module.php file.
How severe is CVE-2021-3256?: CVE-2021-3256 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-3256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3256?: CVE-2021-3256 affects Kuaifan Kuaifancms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3256 published?: CVE-2021-3256 was published on 2021-06-11 and last updated on 2026-06-17.

References

https://github.com/poropro/kuaifan/issues/3

Affected products (1)

cpe:2.3:a:kuaifan:kuaifancms:5.0:*:*:*:*:*:*:*

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