What’s Vulnerable › Vulnerabilities

CVE-2020-28200

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-28 · updated 2026-06-17
• Weakness: CWE-770

Description

The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.

Affected products

• dovecot: before 2.3.15 — fixed in 2.3.15
• Fedoraproject Fedora: 33, 34

How to fix

Upgrade to a fixed version: dovecot 2.3.15. Check the vendor advisory for mitigations.

References

• https://dovecot.org/security
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JB2VTJ3G2ILYWH5Y2FTY2PUHT2MD6VMI/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TK424DWFO2TKJYXZ2H3XL633TYJL4GQN/
• https://www.openwall.com/lists/oss-security/2021/06/28/3
• https://dovecot.org/security
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JB2VTJ3G2ILYWH5Y2FTY2PUHT2MD6VMI/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TK424DWFO2TKJYXZ2H3XL633TYJL4GQN/
• https://www.openwall.com/lists/oss-security/2021/06/28/3

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