Vulnerabilities > CVE-2020-28021 - Unspecified vulnerability in Exim

CVSS 9.0 - CRITICAL

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

SINGLE

Confidentiality impact

COMPLETE

Integrity impact

COMPLETE

Availability impact

COMPLETE

network

low complexity

exim

critical

NVD

Published: 2021-05-06

Updated: 2021-05-10

Summary

Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.

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	115

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28021-MAUTH.txt