CVE-2017-2669

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.

• CWE-20
• CWE-20

• 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

Published

Jun 21, 2018

Last Modified

Jun 17, 2026

Status

Modified

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