What’s Vulnerable › Vulnerabilities

CVE-2020-28023

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-06 · updated 2026-06-17
• Weakness: CWE-125

Description

Exim 4 before 4.94.2 allows Out-of-bounds Read. smtp_setup_msg may disclose sensitive information from process memory to an unauthenticated SMTP client.

Affected products

• Exim: from 4.00 before 4.94.2 — fixed in 4.94.2

How to fix

Upgrade to a fixed version: Exim 4.94.2. Check the vendor advisory for mitigations.

References

• https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28023-SCHAD.txt
• https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28023-SCHAD.txt

Get alerted when CVE-2020-28023 or the next vulnerability affects your stack