CVE-2020-28024

moderate-risk
Published 2021-05-06

Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.

Do I need to act?

~
4.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
+
Fix available
Upgrade to: 919111edac911ba9c15422eafd7c5bf14d416d26
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Exim

References (2)

Third Party Advisory https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28024-UNGET.tx...
Third Party Advisory https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28024-UNGET.tx...
45
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 8/34 · Low
Exposure 5/34 · Minimal