What is CVE-2020-7046?

CVE-2020-7046 is a high-severity vulnerability in Dovecot, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2020-02-12.

How severe is CVE-2020-7046?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Dovecot

CVE-2020-7046

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.

Published 2020-02-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.513 (98.9th percentile), scored 2026-10-29.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 98.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.513 · newest: 0.513 · change: 0.000

Affected products

Dovecot
Fedoraproject Fedora — versions 30, 31

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

dovecot.org/security (Vendor Advisory)
www.openwall.com/lists/oss-security/2020/02/12/1 (Mailing List, Third Party Advisory)
dovecot.org/pipermail/dovecot-news/2020-February/000431.html (Mailing List, Vendor Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2020-7046?: CVE-2020-7046 is a high-severity vulnerability in Dovecot, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2020-02-12.
How severe is CVE-2020-7046?: High severity. CVSS v3 base score is 7.5 out of 10.