How severe is CVE-2021-25927?

CVE-2021-25927 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-2021-25927 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25927?

CVE-2021-25927 affects Safe-flat Project Safe-flat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25927?

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-2021-25927 published?

CVE-2021-25927 was published on 2021-04-26 and last updated on 2026-06-17.

CVE-2021-25927

CVE-2021-25927 is a critical-severity vulnerability in Safe-flat Project Safe-flat 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. The underlying weakness is classified as CWE-1321.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Safe-flat Project Safe-flat
Published: 2021-04-26
Last modified: 2026-06-17

Description

Prototype pollution vulnerability in 'safe-flat' versions 2.0.0 through 2.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.

Frequently asked questions

What is CVE-2021-25927?: Prototype pollution vulnerability in 'safe-flat' versions 2.0.0 through 2.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.
How severe is CVE-2021-25927?: CVE-2021-25927 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-2021-25927 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25927?: CVE-2021-25927 affects Safe-flat Project Safe-flat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25927?: 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-2021-25927 published?: CVE-2021-25927 was published on 2021-04-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:safe-flat_project:safe-flat:*:*:*:*:*:*:*:*

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