CVE-2021-4019

CVE-2021-4019 is a high-severity vulnerability in Neovim with a CVSS 3.x base score of 7.8. 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-122.

Key facts

Description

vim is vulnerable to Heap-based Buffer Overflow

Frequently asked questions

What is CVE-2021-4019?
vim is vulnerable to Heap-based Buffer Overflow
How severe is CVE-2021-4019?
CVE-2021-4019 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-4019 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4019?
CVE-2021-4019 primarily affects Neovim. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-4019?
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-2021-4019 published?
CVE-2021-4019 was published on 2021-12-01 and last updated on 2026-06-17.

References

Affected products (7)

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