CVE-2017-6349 — An integer overflow at a u_read_undo memory allocation site would occur for vim

An integer overflow at a u_read_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate values for tree length when reading a corrupted undo file, which may lead to resultant buffer overflows.

01What is this vulnerability?

An integer overflow at a u_read_undo memory allocation site would occur for vim before patch 8.0.0377, if it does not properly validate values for tree length when reading a corrupted undo file, which may lead to resultant buffer overflows.

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: 2017-02-27T07:59:00.503
• Last modified: 2026-05-13T00:24:29.033

09References

• www.securityfocus.com — http://www.securityfocus.com/bid/96451
• www.securitytracker.com — http://www.securitytracker.com/id/1037949
• github.com — https://github.com/vim/vim/commit/3eb1637b1bba19519885dd6d377bd5596e91d22c
• groups.google.com — https://groups.google.com/forum/#%21topic/vim_dev/LAgsTcdSfNA
• groups.google.com — https://groups.google.com/forum/#%21topic/vim_dev/QPZc0CY9j3Y
• security.gentoo.org — https://security.gentoo.org/glsa/201706-26
• usn.ubuntu.com — https://usn.ubuntu.com/4309-1/
• www.securityfocus.com — http://www.securityfocus.com/bid/96451
• www.securitytracker.com — http://www.securitytracker.com/id/1037949
• github.com — https://github.com/vim/vim/commit/3eb1637b1bba19519885dd6d377bd5596e91d22c