Buffer Underwrite Vulnerability in Exim Email Server
CVE-2020-28024

9.8CRITICAL

Key Information:

Vendor

Exim

Status
Exim
Vendor
CVE Published:
6 May 2021

What is CVE-2020-28024?

A buffer underwrite vulnerability exists in Exim Email Server versions prior to 4.94.2, which allows unauthenticated remote attackers to execute arbitrary commands. This issue arises from the improper handling of character pushback, where non-character error codes such as EOF can be incorrectly processed, leading to potential remote code execution. Users of affected versions are advised to upgrade to the latest version to mitigate exposure to this security risk.

References

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

EPSS Score

5% chance of being exploited in the next 30 days.

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

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CVE-2020-28024 : Buffer Underwrite Vulnerability in Exim Email Server