CVE-2020-28017: exim Integer Overflow or Wraparound

Vulnerability summary

CVE-2020-28017 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in exim. EPSS estimates a 36.90% chance of exploitation in the next 30 days, higher than 98.5% of scored vulnerabilities.

Timeline

1. 06-05-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

Exim 4 before 4.94.2 allows Integer Overflow to Buffer Overflow in receive_add_recipient via an e-mail message with fifty million recipients. NOTE: remote exploitation may be difficult because of resource consumption.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.