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CVE-2020-35680

HIGHCVSS 7.5/10EPSS 3.58%

Last modified

CVE-2020-35680 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.58% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
3.58%

87.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OpensmtpdOpensmtpd< 6.8.0
OpensmtpdOpensmtpd6.8.0
FedoraprojectFedora32
FedoraprojectFedora33

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2020-35680?
CVE-2020-35680 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.58% probability of exploitation in the next 30 days.
How do I fix CVE-2020-35680?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35680?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST