CVE-2020-35680 Null dereference in n/a

What is CVE-2020-35680?

CVE-2020-35680 is a high-severity vulnerability in Fedoraproject Fedora, published on 24 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2020-35680?

It affects 2 products.

Products include Fedoraproject Fedora, Opensmtpd Opensmtpd.

How do I fix CVE-2020-35680?

Upgrade to a fixed version.

Is CVE-2020-35680 being exploited?

There is no known exploitation of CVE-2020-35680 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2020-35680, DEBIAN-CVE-2020-35680, GHSA-924w-4qc7-pc84, UBUNTU-CVE-2020-35680.