CVE-2019-10691

Name: CVE-2019-10691
Creator: NVD / NIST
Published: 2019-04-24T17:29:00.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.80%

Last modified Jun 17, 2026

CVE-2019-10691 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.80% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.80%

84.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Dovecot	Dovecot	< 2.3.5.2
Opensuse	Leap	15.0

References

http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00000.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/04/18/3Mailing List, Third Party Advisory
https://dovecot.org/list/dovecot-news/2019-April/000406.htmlMailing List, Vendor Advisory
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.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/04/18/3Mailing List, Third Party Advisory
https://dovecot.org/list/dovecot-news/2019-April/000406.htmlMailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QHFZ5OWRIZGIWZJ5PTNVWWZNLLNH4XYS/
https://security.gentoo.org/glsa/201908-29

Timeline

Published: Apr 24, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-10691?

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.

How severe is CVE-2019-10691?

Severity scoring for CVE-2019-10691 is pending analysis. The EPSS model estimates a 2.80% probability of exploitation in the next 30 days.

How do I fix CVE-2019-10691?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-10691?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST