CVE-2023-4735 — Out-of-bounds Write in GitHub repository vim/vim prior to 9

Out-of-bounds Write in GitHub repository vim/vim prior to 9.0.1847.

01What is this vulnerability?

Out-of-bounds Write in GitHub repository vim/vim prior to 9.0.1847.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-09-02T18:15:20.637
• Last modified: 2026-06-23T18:17:36.223

09References

• seclists.org — http://seclists.org/fulldisclosure/2023/Oct/24
• github.com — https://github.com/vim/vim/commit/889f6af37164775192e33b233a90e86fd3df0f57
• huntr.dev — https://huntr.dev/bounties/fc83bde3-f621-42bd-aecb-8c1ae44cba51
• support.apple.com — https://support.apple.com/kb/HT213984
• seclists.org — http://seclists.org/fulldisclosure/2023/Oct/24
• github.com — https://github.com/vim/vim/commit/889f6af37164775192e33b233a90e86fd3df0f57
• huntr.dev — https://huntr.dev/bounties/fc83bde3-f621-42bd-aecb-8c1ae44cba51
• support.apple.com — https://support.apple.com/kb/HT213984