Integer Overflow Vulnerability in Exim Email Server
CVE-2020-28017

9.8CRITICAL

Key Information:

Vendor

Exim

Status
Exim
Vendor
CVE Published:
6 May 2021

What is CVE-2020-28017?

The Exim Email Server, prior to version 4.94.2, contains a vulnerability that allows an integer overflow leading to a buffer overflow condition in the receive_add_recipient function. This can be triggered by a malicious email containing an excessively large recipient list, which may be up to fifty million recipients. Exploiting this vulnerability can lead to resource exhaustion, making remote exploitation challenging despite the severity of the issue.

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2020-28017 : Integer Overflow Vulnerability in Exim Email Server