How severe is CVE-2021-26365?

CVE-2021-26365 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2021-26365 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26365?

CVE-2021-26365 primarily affects Amd Ryzen 5 2400g Firmware. In total, 54 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26365?

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.

When was CVE-2021-26365 published?

CVE-2021-26365 was published on 2023-05-09 and last updated on 2026-06-17.

CVE-2021-26365

CVE-2021-26365 is a high-severity vulnerability in Amd Ryzen 5 2400g Firmware with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Amd Ryzen 5 2400g Firmware
Published: 2023-05-09
Last modified: 2026-06-17

Description

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.

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 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2021-26365 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26365?: CVE-2021-26365 primarily affects Amd Ryzen 5 2400g Firmware. In total, 54 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26365?: 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.
When was CVE-2021-26365 published?: CVE-2021-26365 was published on 2023-05-09 and last updated on 2026-06-17.

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001

Affected products (54)

cpe:2.3:o:amd:ryzen_5_2400g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2400ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_2200ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_2200g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_pro_2100ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5900x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5950x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_9_5900_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5800x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5800x3d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5600x_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5500_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3200u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3250c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3250u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:amd_3015e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:amd_3015ce_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_2800h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_2700u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2600h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_2500u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_2300u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_2200u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_3400g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_pro_3400g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_pro_3400ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_pro_3350g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_pro_3350ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_pro_3200g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3200g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_3200ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_pro_3200ge_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5_5500u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3_5300u_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_7_5700ge_firmware:*:*:*:*:*:*:*:*

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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