CVE-2022-0318

Editor crash via multibyte block-insert miscalculation

Published Jan 21, 2022 · Updated Nov 15, 2024

Heap buffer overflow in block insertion in Vim before 8.2.4151 allows context-dependent attackers to crash the editor via crafted text. The block_insert function in src/ops.c passes a pointer beyond the line boundary to the multibyte head-offset routine and misadjusts the block offset. A user must open crafted text and perform Visual block insertion; the out-of-bounds access can crash Vim, with code execution reported.

CVSS severity9.8
Critical
EPSS probability2.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in block insertion in Vim before 8.2.4151 allows context-dependent attackers to crash the editor via crafted text. The block_insert function in src/ops.c passes a pointer beyond the line boundary to the multibyte head-offset routine and misadjusts the block offset. A user must open crafted text and perform Visual block insertion; the out-of-bounds access can crash Vim, with code execution reported.

The record

CVE
CVE-2022-0318
Published
Jan 21, 2022
Updated
Nov 15, 2024
Vendor
Vim
Product
Vim
Classifications
CWE-787, CWE-122, T1204.002, T1203
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <8.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Vim · Vimversion=unspecified <8.2

Published CVSS scores

6.6huntr.devCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1204.002Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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