CVE-2020-14954
mutt: response Injection via STARTTLS in SMTP, POP3 and IMAP
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · June 16, 2020
Updated · November 22, 2025
Description
Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection')