CVE-2020-35680: 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…

PriorityP339high7.5CVSS 3.1

AVNACLPRNUINSUCNINAH

EPSS

3.58%

88.1th percentile

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.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	opensmtpd	< opensmtpd 6.8.0p2-1 (bookworm)	opensmtpd 6.8.0p2-1 (bookworm)
fedoraproject	fedora	—	—
fedoraproject	fedora	—	—
opensmtpd	opensmtpd	< 6.8.0	6.8.0
opensmtpd	opensmtpd	—	—
opensmtpd	opensmtpd	>= 0 < 6.8.0p2-1	6.8.0p2-1
opensmtpd	opensmtpd	>= 0 < 6.8.0p2-1	6.8.0p2-1
opensmtpd	opensmtpd	>= 0 < 6.8.0p2-1	6.8.0p2-1
opensmtpd	opensmtpd	>= 0 < 6.8.0p2-1	6.8.0p2-1

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P

osv7.5HIGH

vendor_debian7.5HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.