CVE-2020-7957

The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.

• CWE-20

• http://www.openwall.com/lists/oss-security/2020/02/12/2Exploit, Mailing List, Third Party Advisory
• https://dovecot.org/pipermail/dovecot-news/2020-February/000430.htmlExploit, Mailing List, Vendor Advisory
• https://dovecot.org/securityVendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/
• http://www.openwall.com/lists/oss-security/2020/02/12/2Exploit, Mailing List, Third Party Advisory
• https://dovecot.org/pipermail/dovecot-news/2020-February/000430.htmlExploit, Mailing List, Vendor Advisory
• https://dovecot.org/securityVendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/

Published

Feb 12, 2020

Last Modified

Jun 17, 2026

Status

Modified

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