Sendmail
Don't miss out!
Thousands of developers use stack.watch to stay informed.Get an email whenever new security vulnerabilities are reported in Sendmail.
By the Year
In 2025 there have been 0 vulnerabilities in Sendmail. Sendmail did not have any published security vulnerabilities last year.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2025 | 0 | 0.00 |
| 2024 | 0 | 0.00 |
| 2023 | 1 | 5.30 |
| 2022 | 1 | 7.40 |
| 2021 | 0 | 0.00 |
| 2020 | 0 | 0.00 |
| 2019 | 0 | 0.00 |
| 2018 | 0 | 0.00 |
It may take a day or so for new Sendmail vulnerabilities to show up in the stats or in the list of recent security vulnerabilties. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Sendmail Security Vulnerabilities
sendmail through 8.17.2 allows SMTP smuggling in certain configurations
CVE-2023-51765
5.3 - Medium
- December 24, 2023
sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
Insufficient Verification of Data Authenticity
ALPACA is an application layer protocol content confusion attack
CVE-2021-3618
7.4 - High
- March 23, 2022
ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim's traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer.
Improper Certificate Validation
Use-after-free vulnerability in Sendmail before 8.13.8
CVE-2006-4434
7.5 - High
- August 29, 2006
Use-after-free vulnerability in Sendmail before 8.13.8 allows remote attackers to cause a denial of service (crash) via a long "header line", which causes a previously freed variable to be referenced. NOTE: the original developer has disputed the severity of this issue, saying "The only denial of service that is possible here is to fill up the disk with core dumps if the OS actually generates different core dumps (which is unlikely)... the bug is in the shutdown code (finis()) which leads directly to exit(3), i.e., the process would terminate anyway, no mail delivery or receiption is affected."
Dangling pointer
Buffer overflow in Sendmail 5.79 to 8.12.7
CVE-2002-1337
- March 07, 2003
Buffer overflow in Sendmail 5.79 to 8.12.7 allows remote attackers to execute arbitrary code via certain formatted address fields, related to sender and recipient header comments as processed by the crackaddr function of headers.c.
Classic Buffer Overflow
