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CVE

CVE-2023-42117

Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote a

Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process.

Was ZDI-CAN-17554.

CRITICAL · CVSS 9.8 EPSS 0.0735
Schedule remediation
  • EPSS percentile: top 8% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-138Improper Neutralization of Special Elements
▤

Affected Products & Versions

1
exim< 4.96.2
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · zdi-disclosures@trendmicro.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 May 2024 · 03:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

5
suse-csafopenSUSE-SU-2024:13333-1
suse-csafopenSUSE-SU-2024:0007-1
usnUSN-6455-1
suse-csafopenSUSE-SU-2023:0303-1
suse-csafopenSUSE-SU-2023:0304-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zerodayinitiative.com/advisories/ZDI-23-1471/Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/10/msg00029.html
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