Exim DMARC dmarc.c dmarc_dns_lookup use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Exim. 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. This vulnerability is traded as CVE-2022-3620. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to apply a patch to fix this issue. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Detailsinfo

A vulnerability was found in Exim (Mail Server Software) (affected version unknown) and classified as problematic. This issue affects the function dmarc_dns_lookup of the file dmarc.c of the component DMARC Handler. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability.

The weakness was shared 10/20/2022 as 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445. It is possible to read the advisory at git.exim.org. The identification of this vulnerability is CVE-2022-3620. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 211164 (Fedora 37 : exim (2022-90e08c08e6)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445 is able to eliminate this problem. The bugfix is ready for download at git.exim.org.

The vulnerability is also documented in the vulnerability database at Tenable (211164). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 5.6
CNA Vector (VulDB): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 211164
Nessus Name: Fedora 37 : exim (2022-90e08c08e6)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445

Timelineinfo

10/20/2022 🔍
10/20/2022 +0 days 🔍
10/20/2022 +0 days 🔍
05/23/2025 +946 days 🔍

Sourcesinfo

Advisory: 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445
Status: Confirmed

CVE: CVE-2022-3620 (🔍)
GCVE (CVE): GCVE-0-2022-3620
GCVE (VulDB): GCVE-100-211919

Entryinfo

Created: 10/20/2022 09:53 PM
Updated: 05/23/2025 10:57 PM
Changes: 10/20/2022 09:53 PM (42), 11/18/2022 06:47 PM (2), 11/18/2022 06:54 PM (21), 11/17/2024 03:28 AM (16), 05/23/2025 10:57 PM (1)
Complete: 🔍
Cache ID: 18:900:40

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