The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function.
https://bugs.exim.org/show_bug.cgi?id=2201
https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
http://openwall.com/lists/oss-security/2017/11/25/3
http://openwall.com/lists/oss-security/2017/11/25/2
http://openwall.com/lists/oss-security/2017/11/25/1
http://www.securitytracker.com/id/1039873
https://www.exploit-db.com/exploits/43184/
Source: MITRE
Published: 2017-11-25
Updated: 2021-05-04
Type: CWE-835
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH