CVE-2023-42118CWE-191

Exim libspf2 Integer Underflow Remote Code Execution Vulnerability

High · published May 3, 2024

CVSS v3.0
7.5
EPSS
8%
Percentile
95.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
7.5 · HIGH
Vector
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.08419 · 95.0th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2024-05-03T02:13Z
EPSS history
Timeline
  • 17 OCT 03:20Z
    EPSS moved 19% → 8%
    epss
  • 04 OCT 03:19Z
    EPSS moved 48% → 22%
    epss
  • 03 MAY 02:13Z
    Exim libspf2 Integer Underflow Remote Code Execution Vulnerability
    cvelistv5