What’s Vulnerable › Vulnerabilities

CVE-2022-37452

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-08-07 · updated 2026-06-17
• Weakness: CWE-787

Description

Exim before 4.95 has a heap-based buffer overflow for the alias list in host_name_lookup in host.c when sender_host_name is set.

Affected products

• Debian Linux: 10.0
• Exim: before 4.95 — fixed in 4.95

How to fix

Upgrade to a fixed version: Exim 4.95. Check the vendor advisory for mitigations.

References

• https://github.com/Exim/exim/commit/d4bc023436e4cce7c23c5f8bb5199e178b4cc743
• https://github.com/Exim/exim/compare/exim-4.94...exim-4.95
• https://github.com/Exim/exim/wiki/EximSecurity
• https://github.com/ivd38/exim_overflow
• https://lists.debian.org/debian-lts-announce/2022/08/msg00014.html
• https://www.exim.org/static/doc/security/
• https://www.openwall.com/lists/oss-security/2022/08/06/8
• https://github.com/Exim/exim/commit/d4bc023436e4cce7c23c5f8bb5199e178b4cc743
• https://github.com/Exim/exim/compare/exim-4.94...exim-4.95
• https://github.com/Exim/exim/wiki/EximSecurity
• https://github.com/ivd38/exim_overflow
• https://lists.debian.org/debian-lts-announce/2022/08/msg00014.html

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