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CVE-2020-28024

CRITICALCVSS 9.8/10EPSS 4.07%

Last modified

CVE-2020-28024 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 4.07% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
4.07%

89.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
EximExim>= 4.00, < 4.94.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-28024?
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.
How severe is CVE-2020-28024?
CVE-2020-28024 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.07% probability of exploitation in the next 30 days.
How do I fix CVE-2020-28024?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28024?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST