How severe is CVE-2021-3795?

CVE-2021-3795 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-3795 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3795?

CVE-2021-3795 primarily affects Semver-regex Project Semver-regex. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3795?

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-2021-3795 published?

CVE-2021-3795 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-3795

CVE-2021-3795 is a high-severity vulnerability in Semver-regex Project Semver-regex with a CVSS 3.x base score of 7.5. 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-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1333
Affected product: Semver-regex Project Semver-regex
Published: 2021-09-15
Last modified: 2026-06-17

Description

semver-regex is vulnerable to Inefficient Regular Expression Complexity

Frequently asked questions

What is CVE-2021-3795?: semver-regex is vulnerable to Inefficient Regular Expression Complexity
How severe is CVE-2021-3795?: CVE-2021-3795 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-3795 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3795?: CVE-2021-3795 primarily affects Semver-regex Project Semver-regex. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3795?: 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-2021-3795 published?: CVE-2021-3795 was published on 2021-09-15 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:semver-regex_project:semver-regex:*:*:*:*:*:*:*:*
cpe:2.3:a:semver-regex_project:semver-regex:4.0.0:*:*:*:*:*:*:*

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