Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.042
EPSS Ranking 88.2%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
- https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
- https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/
- https://security.gentoo.org/glsa/202105-12
- https://www.mail-archive.com/misc%40opensmtpd.org/msg05188.html
- https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
- https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/
- https://security.gentoo.org/glsa/202105-12
- https://www.mail-archive.com/misc%40opensmtpd.org/msg05188.html
Products affected by CVE-2020-35680
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cpe:2.3:a:opensmtpd:opensmtpd:5.0
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cpe:2.3:a:opensmtpd:opensmtpd:5.2.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.3
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cpe:2.3:a:opensmtpd:opensmtpd:5.3.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.3.2
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cpe:2.3:a:opensmtpd:opensmtpd:5.3.3
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cpe:2.3:a:opensmtpd:opensmtpd:5.4
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.2
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.4
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.5
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.6
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.6-2
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cpe:2.3:a:opensmtpd:opensmtpd:5.7.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.7.2
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cpe:2.3:a:opensmtpd:opensmtpd:5.7.3
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cpe:2.3:a:opensmtpd:opensmtpd:5.9.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.9.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.0.0
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cpe:2.3:a:opensmtpd:opensmtpd:6.0.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.0.3
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cpe:2.3:a:opensmtpd:opensmtpd:6.4.0
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cpe:2.3:a:opensmtpd:opensmtpd:6.4.1
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cpe:2.3:a:opensmtpd:opensmtpd:6.4.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.0
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.1
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.3
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.4
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cpe:2.3:a:opensmtpd:opensmtpd:6.7.1
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cpe:2.3:a:opensmtpd:opensmtpd:6.8.0
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cpe:2.3:o:fedoraproject:fedora:32
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cpe:2.3:o:fedoraproject:fedora:33