How severe is CVE-2021-40881?

CVE-2021-40881 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-2021-40881 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40881?

CVE-2021-40881 affects Publiccms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40881?

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-2021-40881 published?

CVE-2021-40881 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-40881

CVE-2021-40881 is a critical-severity vulnerability in Publiccms 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: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Publiccms
Published: 2021-09-15
Last modified: 2026-06-17

Description

An issue in the BAT file parameters of PublicCMS v4.0 allows attackers to execute arbitrary code.

Frequently asked questions

What is CVE-2021-40881?: An issue in the BAT file parameters of PublicCMS v4.0 allows attackers to execute arbitrary code.
How severe is CVE-2021-40881?: CVE-2021-40881 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-2021-40881 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40881?: CVE-2021-40881 affects Publiccms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40881?: 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-2021-40881 published?: CVE-2021-40881 was published on 2021-09-15 and last updated on 2026-06-17.

References

https://github.com/sanluan/PublicCMS/issues/57

Affected products (1)

cpe:2.3:a:publiccms:publiccms:4.0:*:*:*:*:*:*:*

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