CVE-2020-28025 — HIGH (7.5)

Vulnerability Description

Exim 4 before 4.94.2 allows Out-of-bounds Read because pdkim_finish_bodyhash does not validate the relationship between sig->bodyhash.len and b->bh.len; thus, a crafted DKIM-Signature header might lead to a leak of sensitive information from process memory.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Exim	Exim	>= 4.00, < 4.94.2

Related Weaknesses (CWE)

CWE-125

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28025-BHASH.txThird Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28025-BHASH.txThird Party Advisory

FAQ

What is CVE-2020-28025?

CVE-2020-28025 is a vulnerability with a CVSS score of 7.5 (HIGH). Exim 4 before 4.94.2 allows Out-of-bounds Read because pdkim_finish_bodyhash does not validate the relationship between sig->bodyhash.len and b->bh.len; thus, a crafted DKIM-Signature header might lea...

How severe is CVE-2020-28025?

CVE-2020-28025 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-28025?

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