Published: 12/02/2020 Updated: 07/11/2023

CVSS v2 Base Score: 7.8 | Impact Score: 6.9 | Exploitability Score: 10

CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9

VMScore: 694

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

lib-smtp in submission-login and lmtp in Dovecot 2.3.9 prior to 2.3.9.3 mishandles truncated UTF-8 data in command parameters, as demonstrated by the unauthenticated triggering of a submission-login infinite loop.

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dovecot dovecot
fedoraproject fedora 30
fedoraproject fedora 31

A denial of service has been found in Dovecot before 2393, where lib-smtp doesn't handle truncated command parameters properly, resulting in infinite loop taking 100% CPU for the process This happens for LMTP (where it doesn't matter so much) and also for submission-login where unauthenticated users can trigger it ...

CWE-835 http://www.openwall.com/lists/oss-security/2020/02/12/1 https://dovecot.org/pipermail/dovecot-news/2020-February/000431.html https://dovecot.org/security 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/https://nvd.nist.gov https://security.archlinux.org/CVE-2020-7046

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CVE-2020-7046

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