CVE-2020-28024 — CRITICAL (9.8)

Q: How severe is CVE-2020-28024?

CVE-2020-28024 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2020-28024?

Check the references section above for vendor advisories and patch information. Affected products include: Exim Exim.

Vulnerability 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.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Exim	Exim	>= 4.00, < 4.94.2

Related Weaknesses (CWE)

CWE-787

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28024-UNGET.txThird Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28024-UNGET.txThird Party Advisory

FAQ

What is CVE-2020-28024?

CVE-2020-28024 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 a...

How severe is CVE-2020-28024?

CVE-2020-28024 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2020-28024?

Check the references section above for vendor advisories and patch information. Affected products include: Exim Exim.