What’s Vulnerable › Vulnerabilities

CVE-2020-7046

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 51.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-02-12 · updated 2026-06-17
• Weakness: CWE-835

Description

lib-smtp in submission-login and lmtp in Dovecot 2.3.9 before 2.3.9.3 mishandles truncated UTF-8 data in command parameters, as demonstrated by the unauthenticated triggering of a submission-login infinite loop.

Affected products

• dovecot: from 2.3.9 before 2.3.9.3 — fixed in 2.3.9.3
• Fedoraproject Fedora: 30, 31

How to fix

Upgrade to a fixed version: dovecot 2.3.9.3. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/02/12/1
• https://dovecot.org/pipermail/dovecot-news/2020-February/000431.html
• https://dovecot.org/security
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/
• http://www.openwall.com/lists/oss-security/2020/02/12/1
• https://dovecot.org/pipermail/dovecot-news/2020-February/000431.html
• https://dovecot.org/security
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/

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