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Fencer Vulns
critical 9.8

CVE-2022-37452 json

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.

published 2022-08-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-40078

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • exim exim 4.95
  • exim4 Debian 14, Debian 13, Debian 12 4.94.2-5

debian advisories DEBIAN-CVE-2022-37452

  • exim4 Ubuntu 18.04 LTS 4.90.1-1ubuntu1.9
  • exim4 Ubuntu 20.04 LTS 4.93-13ubuntu1.6
  • exim4 Ubuntu Pro 14.04 LTS 4.82-3ubuntu2.4+esm4
  • exim4 Ubuntu Pro 16.04 LTS 4.86.2-2ubuntu2.6+esm2

ubuntu advisories UBUNTU-CVE-2022-37452

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-37452 updated

Exim: heap-based buffer overflow in host_name_lookup in host.c.

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.77% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/ivd38/exim_overflow referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.