CVE-2022-0128Public exploit

Memory exposure via unterminated command lookahead

Published Jan 6, 2022 · Updated Aug 2, 2024

Out-of-bounds read in Vim 8.2.2806 through 8.2.4008 allows local users to expose memory by compiling a crafted Vim9 function. find_ex_command and compile_def_function compare a command terminator with the following byte before first verifying that the current byte is not NUL. The trigger requires execution of attacker-controlled Vim9 source, and the resulting one-byte over-read can expose adjacent process data or crash the editor.

CVSS severity7.8
High
EPSS probability1.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Vim 8.2.2806 through 8.2.4008 allows local users to expose memory by compiling a crafted Vim9 function. find_ex_command and compile_def_function compare a command terminator with the following byte before first verifying that the current byte is not NUL. The trigger requires execution of attacker-controlled Vim9 source, and the resulting one-byte over-read can expose adjacent process data or crash the editor.

The record

CVE
CVE-2022-0128
Published
Jan 6, 2022
Updated
Aug 2, 2024
Vendor
Vim
Product
Vim
Classifications
CWE-125, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 privilegesunauthenticated

What is affected?

Vim · Vimversion=unspecified <8.2

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.1huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002User Execution Malicious File
T1203Exploitation for Client Execution

Public exploit references

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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