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Vulnerability · Published Dec 24, 2020 · Assigned by mitre

CVE-2020-35679

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 2.8% (higher than 86% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High
Exploit odds (30 days)2.8%top 13.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a "very significant" memory leak via messages to an instance that performs many regex lookups.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12opensmtpd6.8.0p2-1DEBIAN-CVE-2020-35679
Debian:13opensmtpd6.8.0p2-1DEBIAN-CVE-2020-35679
Debian:14opensmtpd6.8.0p2-1DEBIAN-CVE-2020-35679
Ubuntu:22.04:LTSopensmtpdno fix listedUBUNTU-CVE-2020-35679
Ubuntu:24.04:LTSopensmtpdno fix listedUBUNTU-CVE-2020-35679
Ubuntu:25.10opensmtpdno fix listedUBUNTU-CVE-2020-35679
Ubuntu:26.04:LTSopensmtpdno fix listedUBUNTU-CVE-2020-35679
Ubuntu:26.10opensmtpdno fix listedUBUNTU-CVE-2020-35679

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References