How severe is CVE-2021-3172?

CVE-2021-3172 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-3172 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3172?

CVE-2021-3172 affects Php-fusion. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3172?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3172 published?

CVE-2021-3172 was published on 2023-02-17 and last updated on 2026-06-17.

CVE-2021-3172

CVE-2021-3172 is a high-severity vulnerability in Php-fusion with a CVSS 3.x base score of 8.1. 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-732.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Php-fusion
Published: 2023-02-17
Last modified: 2026-06-17

Description

An issue in Php-Fusion v9.03.90 fixed in v9.10.00 allows authenticated attackers to cause a Distributed Denial of Service via the Polling feature.

Frequently asked questions

What is CVE-2021-3172?: An issue in Php-Fusion v9.03.90 fixed in v9.10.00 allows authenticated attackers to cause a Distributed Denial of Service via the Polling feature.
How severe is CVE-2021-3172?: CVE-2021-3172 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-3172 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3172?: CVE-2021-3172 affects Php-fusion. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3172?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3172 published?: CVE-2021-3172 was published on 2023-02-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:php-fusion:php-fusion:*:*:*:*:*:*:*:*

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