CVE-2020-35680
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Opensmtpd
PublishedDec 24, 2020
First seenDec 24, 2020
How to fix
Update
- opensmtpd opensmtpd6.8.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| opensmtpd opensmtpd | v < 6.8.0, 6.8.0 | 6.8.0 |
| fedoraproject fedora | 32, 33 | — |
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