CVE-2020-35680 is a denial-of-service vulnerability affecting OpenSMTPD versions prior to 6.8.0p1, specifically within its smtpd/lka_filter.c component. A remote attacker can trigger a NULL pointer dereference and daemon crash by sending a crafted pattern of client activity, exploiting a flaw in how the filter state machine manages I/O channels. Rated 7.5 HIGH on CVSS, this vulnerability requires no user interaction or privileges, but its impact is limited to availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 6.8.0CPE matchmatch criteria | cpe:2.3:a:opensmtpd:opensmtpd:*:*:*:*:*:*:*:* | ||
6.8.0CPE matchmatch criteria | cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:-:*:*:*:*:*:* | ||
6.8.0CPE matchmatch criteria | cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:patch1-rc1:*:*:*:*:*:* | ||
32CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.