Security readout for executives and security teams
CVE-2021-4187 is a use-after-free flaw in Vim. An attacker would need local context and user interaction, such as getting a user to open content in Vim. The public score shows possible high integrity and availability impact, but the record does not show internet-remote exposure or known active exploitation. Exposure is most likely on workstations, servers, build images, and macOS/Linux systems with vulnerable Vim packages installed. Risk is higher where users or automation open untrusted files in Vim. The bundle does not specify exact vulnerable version ranges. Handle this as a normal patch-management item, not an emergency internet-exposed incident. Prioritize developer workstations, administrative servers, and managed macOS/Linux fleets because Vim is widely installed and the rated impact includes integrity and availability. Mitigation focus: Update Vim using the operating system or vendor package channel.; Prioritize systems where Vim opens untrusted files or runs in privileged workflows.; Apply vendor security updates from Fedora, Apple, Gentoo, Debian, or the relevant distributor..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-416: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-4187 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H1.35.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://huntr.dev/bounties/a8bee03a-6e2e-43bf-bee3-4968c5386a2eCVE reference · x_refsource_CONFIRM
- https://github.com/vim/vim/commit/4bf1006cae7e87259ccd5219128c3dba75774441CVE reference · x_refsource_MISC
- FEDORA-2022-a3d70b50f0CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2022-48b86d586fCVE reference · vendor-advisory, x_refsource_FEDORA
- https://support.apple.com/kb/HT213183CVE reference · x_refsource_CONFIRM
- https://support.apple.com/kb/HT213256CVE reference · x_refsource_CONFIRM
- https://support.apple.com/kb/HT213343CVE reference · x_refsource_CONFIRM
- GLSA-202208-32CVE reference · vendor-advisory, x_refsource_GENTOO
- https://lists.debian.org/debian-lts-announce/2025/03/msg00023.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.