Vulnerabilities > CVE-2020-28022 - Out-of-bounds Write vulnerability in Exim

CVSS 9.8 - CRITICAL

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

HIGH

Integrity impact

HIGH

Availability impact

HIGH

network

low complexity

exim

CWE-787

critical

NVD

Published: 2021-05-06

Updated: 2022-06-28

Summary

Exim 4 before 4.94.2 has Improper Restriction of Write Operations within the Bounds of a Memory Buffer. This occurs when processing name=value pairs within MAIL FROM and RCPT TO commands.

Vulnerable Configurations

Part	Description	Count
Application	Exim Exim Exim 4.00 Exim Exim 4.01 Exim Exim 4.02 Exim Exim 4.03 Exim Exim 4.04 Exim Exim 4.05 Exim Exim 4.10 Exim Exim 4.11 Exim Exim 4.12 Exim Exim 4.14 Exim Exim 4.20 Exim Exim 4.21 Exim Exim 4.22 Exim Exim 4.23 Exim Exim 4.24 Exim Exim 4.30 Exim Exim 4.31 Exim Exim 4.32 Exim Exim 4.33 Exim Exim 4.34 Exim Exim 4.40 Exim Exim 4.41 Exim Exim 4.42 Exim Exim 4.43 Exim Exim 4.44 Exim Exim 4.50 Exim Exim 4.51 Exim Exim 4.52 Exim Exim 4.53 Exim Exim 4.54 Exim Exim 4.60 Exim Exim 4.61 Exim Exim 4.62 Exim Exim 4.63 Exim Exim 4.64 Exim Exim 4.65 Exim Exim 4.66 Exim Exim 4.67 Exim Exim 4.68 Exim Exim 4.69 Exim Exim 4.70 Exim Exim 4.71 Exim Exim 4.72 Exim Exim 4.73 Exim Exim 4.74 Exim Exim 4.75 Exim Exim 4.76 Exim Exim 4.77 Exim Exim 4.80 Exim Exim 4.80.1 Exim Exim 4.82 Exim Exim 4.82.1 Exim Exim 4.84.2 Exim Exim 4.85 Exim Exim 4.85.1 Exim Exim 4.85.2 Exim Exim 4.86 Exim Exim 4.86.1 Exim Exim 4.86.2 Exim Exim 4.87 Exim Exim 4.87.1 Exim Exim 4.88 Exim Exim 4.89 Exim Exim 4.89.1 Exim Exim 4.90 Exim Exim 4.90.0.22 Exim Exim 4.90.0.27 Exim Exim 4.90.1 Exim Exim 4.91 Exim Exim 4.92 Exim Exim 4.92.1 Exim Exim 4.92.2 Exim Exim 4.93 Exim Exim 4.93.0.4 Exim Exim 4.93.0.4-3.1 Exim Exim 4.94 Exim Exim 4.94.1	122

Common Weakness Enumeration (CWE)

CWE-787 - Out-of-bounds Write

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28022-EXOPT.txt