CVE-2021-26365
About
Certain size values in firmware binary headers
could trigger out of bounds reads during signature validation, leading to
denial of service or potentially limited leakage of information about
out-of-bounds memory contents.
Rainforest analyst review
Certain size values in AMD firmware binary headers can trigger out-of-bounds reads during signature validation, leading either to denial of service or a limited leak of out-of-bounds memory contents. It's a firmware-layer flaw with a deliberately bounded impact, no code execution claimed.
The practical severity is modest despite the 8.2: the worst realistic outcomes are a crash or a small, constrained information leak, and reaching the signature-validation path with a malformed header is itself a precondition. This isn't a broad remote takeover primitive.
Our angle is firmware inventory across the affected AMD parts, prioritized modestly given the limited impact. We note explicitly that the outcome is DoS or a bounded leak so it isn't over-weighted, and slot it into firmware maintenance rather than urgent response.
References
Related CVEs
Frequently asked questions
What is CVE-2021-26365?
Certain size values in firmware binary headers could trigger out of bounds reads during signature validation, leading to denial of service or potentially limited leakage of information about out-of-bounds memory contents.
How severe is CVE-2021-26365?
CVE-2021-26365 carries a CVSS 3.1 base score of 8.2, rated high. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 82 out of 100, in the high band.
How is CVE-2021-26365 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality Low, integrity None and availability High.
Which products are affected by CVE-2021-26365?
Public advisories list the following as affected: amd 3015ce, amd 3015ce firmware, amd 3015e, amd 3015e firmware, ryzen 3 2200g, ryzen 3 2200g firmware, +102. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2021-26365?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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