What’s Vulnerable › Vulnerabilities

CVE-2019-10691

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-24 · updated 2026-06-17

Description

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Affected products

• dovecot: before 2.3.5.2 — fixed in 2.3.5.2
• openSUSE Leap: 15.0

How to fix

Upgrade to a fixed version: dovecot 2.3.5.2. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00000.html
• http://www.openwall.com/lists/oss-security/2019/04/18/3
• https://dovecot.org/list/dovecot-news/2019-April/000406.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QHFZ5OWRIZGIWZJ5PTNVWWZNLLNH4XYS/
• https://security.gentoo.org/glsa/201908-29
• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00000.html
• http://www.openwall.com/lists/oss-security/2019/04/18/3
• https://dovecot.org/list/dovecot-news/2019-April/000406.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QHFZ5OWRIZGIWZJ5PTNVWWZNLLNH4XYS/
• https://security.gentoo.org/glsa/201908-29

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