CVE-2023-42118
Exim libspf2 Integer Underflow Remote Code Execution Vulnerability.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 51.8%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 51.75% probability · 99th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-191
- Affected
- libspf2 project/libspf2
- Source
- zdi-disclosures@trendmicro.com
References
- https://www.zerodayinitiative.com/advisories/ZDI-23-1472/Third Party Advisory
- http://www.openwall.com/lists/oss-security/2025/03/28/1Mailing List
- https://www.zerodayinitiative.com/advisories/ZDI-23-1472/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.