CVE-2023-4874 — Null pointer dereference when viewing a specially crafted email in Mutt >1

Null pointer dereference when viewing a specially crafted email in Mutt >1.5.2 <2.2.12

01What is this vulnerability?

Null pointer dereference when viewing a specially crafted email in Mutt >1.5.2 <2.2.12

02Affected products

Vendor	Product	Versions
Mutt	Mutt	1.5.2

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: 2023-09-09T14:30:29.741Z
• Last modified: 2024-08-30T15:16:17.679Z

09References

• gitlab.com — https://gitlab.com/muttmua/mutt/-/commit/452ee330e094bfc7c9a68555e5152b182653455…
• gitlab.com — https://gitlab.com/muttmua/mutt/-/commit/a4752eb0ae0a521eec02e59e51ae5daedf74fda…