How severe is CVE-2021-27983?

CVE-2021-27983 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27983 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27983?

CVE-2021-27983 affects Max-3000 Maxsite Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27983?

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

When was CVE-2021-27983 published?

CVE-2021-27983 was published on 2021-12-10 and last updated on 2026-06-17.

CVE-2021-27983

CVE-2021-27983 is a critical-severity vulnerability in Max-3000 Maxsite Cms with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Max-3000 Maxsite Cms
Published: 2021-12-10
Last modified: 2026-06-17

Description

Remote Code Execution (RCE) vulnerability exists in MaxSite CMS v107.5 via the Documents page.

Frequently asked questions

What is CVE-2021-27983?: Remote Code Execution (RCE) vulnerability exists in MaxSite CMS v107.5 via the Documents page.
How severe is CVE-2021-27983?: CVE-2021-27983 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27983 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27983?: CVE-2021-27983 affects Max-3000 Maxsite Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27983?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27983 published?: CVE-2021-27983 was published on 2021-12-10 and last updated on 2026-06-17.

References

https://github.com/maxsite/cms/issues/430

Affected products (1)

cpe:2.3:a:max-3000:maxsite_cms:107.5:*:*:*:*:*:*:*

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