CVSS 3.1 Score 5.3 of 10 (medium)


Published Dec 24, 2023
Updated: Jan 18, 2024
CWE ID 345


CVE-2023-51765, also known as sendmail through 8.17.2 vulnerability, affects various products including Qtq-2v, Qtq-2o, and Qtq-2_. This vulnerability allows remote attackers to perform SMTP smuggling by injecting e-mail messages with a spoofed MAIL FROM address. This can bypass SPF protection mechanisms due to a difference in the way sendmail and other popular e-mail servers handle certain characters. The vulnerability has been resolved in version 8.18 and later versions with 'o' in srv_features. The base severity of this vulnerability is rated as MEDIUM with a base score of 5.3 according to NIST's National Vulnerability Database (NVD).

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