CVE-2020-35680: Null Pointer Dereference
smtpd/lkafilter.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 Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2020-35680?
CVE-2020-35680 is a vulnerability in OpenSMTPD before 6.8.0p1 that can allow remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity.
How does CVE-2020-35680 impact OpenSMTPD?
CVE-2020-35680 can cause a denial of service in OpenSMTPD, leading to a crash of the daemon.
What is the severity of CVE-2020-35680?
The severity of CVE-2020-35680 is high, with a CVSS score of 7.5.
Which versions of OpenSMTPD are affected by CVE-2020-35680?
OpenSMTPD versions before 6.8.0p1 are affected by CVE-2020-35680.
How can I fix CVE-2020-35680?
To fix CVE-2020-35680, it is recommended to update to OpenSMTPD 6.8.0p1 or later.