CVE-2021-3807

CVE-2021-3807 is a high-severity vulnerability in Ansi-regex Project Ansi-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

Description

ansi-regex is vulnerable to Inefficient Regular Expression Complexity

Frequently asked questions

What is CVE-2021-3807?
ansi-regex is vulnerable to Inefficient Regular Expression Complexity
How severe is CVE-2021-3807?
CVE-2021-3807 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-2021-3807 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-2021-3807?
CVE-2021-3807 primarily affects Ansi-regex Project Ansi-regex. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3807?
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-2021-3807 published?
CVE-2021-3807 was published on 2021-09-17 and last updated on 2026-06-17.

References

Affected products (5)

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