CVE-2017-2669

Name: CVE-2017-2669
Creator: NVD / NIST
Published: 2018-06-21T13:29:00.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.64%

Last modified Jun 17, 2026

CVE-2017-2669 is a vulnerability of currently unknown severity. Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. EPSS estimates a 4.64% chance of exploitation in the next 30 days.

Description

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

Metrics

EPSS Probability

4.64%

90.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Dovecot	Dovecot	>= 2.2.26, <= 2.2.28
Debian	Debian Linux	8.0

References

http://www.openwall.com/lists/oss-security/2017/04/11/1Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/97536Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669Issue Tracking, Third Party Advisory
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.htmlVendor Advisory
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patchThird Party Advisory
https://www.debian.org/security/2017/dsa-3828Third Party Advisory
http://www.openwall.com/lists/oss-security/2017/04/11/1Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/97536Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669Issue Tracking, Third Party Advisory
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.htmlVendor Advisory
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patchThird Party Advisory
https://www.debian.org/security/2017/dsa-3828Third Party Advisory

Timeline

Published: Jun 21, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-2669?

How severe is CVE-2017-2669?

Severity scoring for CVE-2017-2669 is pending analysis. The EPSS model estimates a 4.64% probability of exploitation in the next 30 days.

How do I fix CVE-2017-2669?

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-2017-2669?

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

Scan your code now

Source: NVD / NIST