Memory corruption via unbounded binary-number conversion
Published Sep 2, 2023 · Updated Jun 23, 2026
Out-of-bounds write in Vim before 9.0.1847 allows local users to corrupt process memory through crafted binary-number input. The do_addsub() conversion loop writes generated binary digits into fixed-size buf2 without limiting its index to the buffer length. A user must invoke an add or subtract command on the malicious value; Debian documents a CLI crash and no additional security impact.
Summary
What happened
Out-of-bounds write in Vim before 9.0.1847 allows local users to corrupt process memory through crafted binary-number input. The do_addsub() conversion loop writes generated binary digits into fixed-size buf2 without limiting its index to the buffer length. A user must invoke an add or subtract command on the malicious value; Debian documents a CLI crash and no additional security impact.
The record
- CVE
- CVE-2023-4735
- Published
- Sep 2, 2023
- Updated
- Jun 23, 2026
- Vendor
- Vim
- Product
- Vim
- Classifications
- CWE-787, T1204.002
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 2, 2023CVE publishedPublication date reported by the CVE source.
- Jun 23, 2026Record 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.
- Affected versionversion=unspecified <9.0.1847
What conditions does exploitation require?
What is affected?
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.
Public exploit references
- huntr proof of concept for CVE-2023-4735proof of concept · unverified
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Technologies
Your stack
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Your stack
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