Exim Regex use after free

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.5$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Exim. Impacted is an unknown function of the component Regex Handler. The manipulation leads to use after free. This vulnerability is listed as CVE-2022-3559. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Exim (Mail Server Software) (affected version not known) and classified as problematic. This issue affects some unknown functionality of the component Regex 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 presented 10/17/2022 as 2915 as confirmed bug (Website). The advisory is shared at bugs.exim.org. The identification of this vulnerability is CVE-2022-3559. The exploitation is known to be difficult. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 209857 (Debian dla-3938 : exim4 - security update), which helps to determine the existence of the flaw in a target environment.

Applying the patch 4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2 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 (209857). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 4.6
CNA Vector (VulDB): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 209857
Nessus Name: Debian dla-3938 : exim4 - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2

Timelineinfo

10/17/2022 🔍
10/17/2022 +0 days 🔍
10/17/2022 +0 days 🔍
05/23/2025 +949 days 🔍

Sourcesinfo

Advisory: 2915
Status: Confirmed

CVE: CVE-2022-3559 (🔍)
GCVE (CVE): GCVE-0-2022-3559
GCVE (VulDB): GCVE-100-211073

Entryinfo

Created: 10/17/2022 17:08
Updated: 05/23/2025 22:57
Changes: 10/17/2022 17:08 (40), 10/19/2022 07:15 (14), 11/09/2022 20:50 (2), 11/09/2022 20:58 (21), 10/29/2024 12:58 (16), 05/23/2025 22:57 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!