What’s Vulnerable › Vulnerabilities

CVE-2020-15955

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-17 · updated 2026-06-17
• Weakness: CWE-77

Description

In s/qmail through 4.0.07, an active MitM can inject arbitrary plaintext commands into a STARTTLS encrypted session between an SMTP client and s/qmail. This allows e-mail messages and user credentials to be sent to the MitM attacker.

Affected products

• Fehcom S/Qmail: through 4.0.07

References

• https://nostarttls.secvuln.info/
• https://www.fehcom.de/sqmail/sqmail.html
• https://nostarttls.secvuln.info/
• https://www.fehcom.de/sqmail/sqmail.html

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