Vulnerability Details : CVE-2023-42118
Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account.
. Was ZDI-CAN-17578.
Vulnerability category: Execute code
Products affected by CVE-2023-42118
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Exploit prediction scoring system (EPSS) score for CVE-2023-42118
1.87%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 82 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-42118
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
1.6
|
5.9
|
Zero Day Initiative | 2024-05-03 |
CWE ids for CVE-2023-42118
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The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.Assigned by: zdi-disclosures@trendmicro.com (Secondary)
References for CVE-2023-42118
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https://www.zerodayinitiative.com/advisories/ZDI-23-1472/
ZDI-23-1472 | Zero Day Initiative
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http://www.openwall.com/lists/oss-security/2025/03/28/1
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