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Vulnerability · Published Dec 24, 2020 · Assigned by mitre

CVE-2020-35680

High 7.5

In plain English

A high-severity security flaw in the opensmtpd package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.7% (higher than 90% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High
Exploit odds (30 days)3.7%top 10.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12opensmtpd6.8.0p2-1DEBIAN-CVE-2020-35680
Debian:13opensmtpd6.8.0p2-1DEBIAN-CVE-2020-35680
Debian:14opensmtpd6.8.0p2-1DEBIAN-CVE-2020-35680
Ubuntu:22.04:LTSopensmtpdno fix listedUBUNTU-CVE-2020-35680
Ubuntu:24.04:LTSopensmtpdno fix listedUBUNTU-CVE-2020-35680
Ubuntu:25.10opensmtpdno fix listedUBUNTU-CVE-2020-35680
Ubuntu:26.04:LTSopensmtpdno fix listedUBUNTU-CVE-2020-35680
Ubuntu:26.10opensmtpdno fix listedUBUNTU-CVE-2020-35680

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References