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CVE-2020-35680

Published: 24 December 2020

smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
opensmtpd
Launchpad, Ubuntu, Debian
impish Ignored
(end of life)
trusty Needs triage

kinetic Ignored
(end of life, was needed)
jammy Needed

bionic Not vulnerable
(code not present)
focal Needed

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
upstream Needs triage

xenial Not vulnerable
(code not present)
mantic Needed

lunar Ignored
(end of life, was needed)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H