CVE-2026-40677

CVE-2026-40677 is a high-severity vulnerability with a CVSS 4.0 base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

The use of insecure HTTP transport within AMD optional tools could allow an attacker to conduct a man-in-the-middle attack, potentially leading to arbitrary code execution.

Frequently asked questions

What is CVE-2026-40677?
The use of insecure HTTP transport within AMD optional tools could allow an attacker to conduct a man-in-the-middle attack, potentially leading to arbitrary code execution.
How severe is CVE-2026-40677?
CVE-2026-40677 has a CVSS 4.0 base score of 7.7, rated high severity.
Is CVE-2026-40677 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40677?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40677 have an EU (EUVD) identifier?
Yes. CVE-2026-40677 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36488.
When was CVE-2026-40677 published?
CVE-2026-40677 was published on 2026-06-12 and last updated on 2026-06-17.

References