CVE-2022-1897Public exploit

Memory corruption via substitute-time undo

Published May 27, 2022 · Updated Nov 3, 2025

Out-of-bounds write in Vim before 8.2.5023 allows local users to corrupt memory by running a crafted substitute expression. During expression replacement, vim_regsub_both() sizes an output buffer before a callback can invoke undo and change the text later copied into that allocation. Execution requires a local user to run the crafted expression; the overwrite can crash Vim or corrupt process memory.

CVSS severity7.8
High
EPSS probability1.54%
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 write in Vim before 8.2.5023 allows local users to corrupt memory by running a crafted substitute expression. During expression replacement, vim_regsub_both() sizes an output buffer before a callback can invoke undo and change the text later copied into that allocation. Execution requires a local user to run the crafted expression; the overwrite can crash Vim or corrupt process memory.

The record

CVE
CVE-2022-1897
Published
May 27, 2022
Updated
Nov 3, 2025
Vendor
Vim
Product
Vim
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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
7.8huntr.devCVSS:3.0/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

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-787Out-of-bounds Write
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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