CVE-2019-19783

Name: CVE-2019-19783
Creator: NVD / NIST
Published: 2019-12-16T14:15:12.257+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.65%

Last modified Jun 17, 2026

CVE-2019-19783 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in Cyrus IMAP before 2.5.15, 3.0.x before 3.0.13, and 3.1.x through 3.1.8. If sieve script uploading is allowed (3.x) or certain non-default sieve options are enabled (2.x), a user with a mail account on the service can use a sieve script containing a fileinto directive to create any mailbox with administrator privileges, because of folder mishandling in autosieve_createfolder() in imap/lmtp_sieve.c.. EPSS estimates a 1.65% chance of exploitation in the next 30 days.

Description

An issue was discovered in Cyrus IMAP before 2.5.15, 3.0.x before 3.0.13, and 3.1.x through 3.1.8. If sieve script uploading is allowed (3.x) or certain non-default sieve options are enabled (2.x), a user with a mail account on the service can use a sieve script containing a fileinto directive to create any mailbox with administrator privileges, because of folder mishandling in autosieve_createfolder() in imap/lmtp_sieve.c.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.65%

73.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-269

Affected Software

Vendor	Product	Versions
Cyrus	Imap	>= 2.5.0, < 2.5.15
Cyrus	Imap	>= 3.0.0, < 3.0.13
Cyrus	Imap	>= 3.1.0, < 3.1.8
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31
Canonical	Ubuntu Linux	18.04

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2DIV4HQ6LG5GPRO4B5Z2NHCZUPBUVVVF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IGOO5UGEBBDPN7B2YXLK7I7L3Y35EBA/
https://seclists.org/bugtraq/2019/Dec/38Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202006-23Third Party Advisory
https://usn.ubuntu.com/4566-1/Third Party Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.15.htmlPatch, Release Notes, Vendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.13.htmlPatch, Release Notes, Vendor Advisory
https://www.debian.org/security/2019/dsa-4590Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2DIV4HQ6LG5GPRO4B5Z2NHCZUPBUVVVF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IGOO5UGEBBDPN7B2YXLK7I7L3Y35EBA/
https://seclists.org/bugtraq/2019/Dec/38Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202006-23Third Party Advisory
https://usn.ubuntu.com/4566-1/Third Party Advisory
https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.15.htmlPatch, Release Notes, Vendor Advisory
https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.13.htmlPatch, Release Notes, Vendor Advisory
https://www.debian.org/security/2019/dsa-4590Third Party Advisory

Timeline

Published: Dec 16, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19783?

How severe is CVE-2019-19783?

CVE-2019-19783 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.65% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19783?

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-2019-19783?

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

Scan your code now

Source: NVD / NIST