CVE-2022-3620

Name: CVE-2022-3620
Creator: NVD / NIST
Published: 2022-10-20T20:15:09.69+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2022-3620 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability was found in Exim and classified as problematic. This issue affects the function dmarc_dns_lookup of the file dmarc.c of the component DMARC Handler. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

A vulnerability was found in Exim and classified as problematic. This issue affects the function dmarc_dns_lookup of the file dmarc.c of the component DMARC Handler. The manipulation leads to use after free. The attack may be initiated remotely. The name of the patch is 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-211919.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.73%

49.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Exim	Exim	>= 4.95, < 4.97
Fedoraproject	Fedora	35
Fedoraproject	Fedora	36
Fedoraproject	Fedora	37

References

https://git.exim.org/exim.git/commit/12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445Mailing List, Patch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/667V3ADXQ2MHUJMSXA3VZZEWLVSCIBEU/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EIH4W5R7SHTUEQFWWKB4TUO5YFZX64KV/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XV2K2AWF62FSJ64B5CUZPFT4COK7P5PM/Third Party Advisory
https://vuldb.com/?id.211919Third Party Advisory
https://git.exim.org/exim.git/commit/12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445Mailing List, Patch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/667V3ADXQ2MHUJMSXA3VZZEWLVSCIBEU/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EIH4W5R7SHTUEQFWWKB4TUO5YFZX64KV/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XV2K2AWF62FSJ64B5CUZPFT4COK7P5PM/Third Party Advisory
https://vuldb.com/?id.211919Third Party Advisory

Timeline

Published: Oct 20, 2022
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2022-3620?

How severe is CVE-2022-3620?

CVE-2022-3620 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2022-3620?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-3620?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST