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Fencer Vulns
medium 4.6

CVE-2022-3559 json

Exim Regex use after free

published 2022-10-17 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-42925

cvss
4.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.0%
EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

A vulnerability was found in Exim and classified as problematic. This issue affects some unknown processing of the component Regex Handler. The manipulation leads to use after free. The name of the patch is 4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2. It is recommended to apply a patch to fix this issue. The identifier VDB-211073 was assigned to this vulnerability.

Patch / fix

  • exim exim 4.97
  • exim4 Debian 14, Debian 13, Debian 12 4.96-4

debian advisories DEBIAN-CVE-2022-3559

  • exim4 Ubuntu 18.04 LTS 4.90.1-1ubuntu1.10
  • exim4 Ubuntu 20.04 LTS 4.93-13ubuntu1.7
  • exim4 Ubuntu 22.04 LTS 4.95-4ubuntu2.2

ubuntu advisories UBUNTU-CVE-2022-3559

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

  • exim openSUSE Tumbleweed 4.96-3.1
  • exim Package Hub 15 SP5, openSUSE Leap 15.5 4.97.1-bp155.5.9.1
  • exim Package Hub 15 SP3, openSUSE Leap 15.3 4.94.2-bp153.5.1
  • exim Package Hub 15 SP4, openSUSE Leap 15.4 4.94.2-bp154.2.3.1

opensuse advisories openSUSE-SU-2024:12422-1openSUSE-SU-2024:0007-1openSUSE-SU-2022:10191-1openSUSE-SU-2022:10168-1

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-2022-3559 updated cvss 9.8

exim: use after free in processing of the component Regex Handler

  • 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

5.05% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.6 CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • unspecified Exim

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-416 Use After Free

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.