CVE-2021-26339 — MEDIUM (5.5)

Q: How severe is CVE-2021-26339?

CVE-2021-26339 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2021-26339?

Check the references section above for vendor advisories and patch information. Affected products include: Amd Epyc 7763 Firmware, Amd Epyc 7763, Amd Epyc 7713P Firmware, Amd Epyc 7713P, Amd Epyc 7713 Firmware.

Vulnerability Description

A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU core hang resulting in a potential denial of service. AMD believes the specific code includes a specific x86 instruction sequence that would not be generated by compilers.

CVSS Score

5.5

MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Amd	Epyc 7763 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7763	-
Amd	Epyc 7713P Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7713P	-
Amd	Epyc 7713 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7713	-
Amd	Epyc 7663 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7663	-
Amd	Epyc 7643 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7643	-
Amd	Epyc 75F3 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 75F3	-
Amd	Epyc 7543P Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7543P	-
Amd	Epyc 7543 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7543	-
Amd	Epyc 7513 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7513	-
Amd	Epyc 7453 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7453	-

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028Vendor Advisory

FAQ

What is CVE-2021-26339?

CVE-2021-26339 is a vulnerability with a CVSS score of 5.5 (MEDIUM). A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU core hang resulting in a potential denial of service. AMD believes the specific c...

How severe is CVE-2021-26339?

CVE-2021-26339 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-26339?

Check the references section above for vendor advisories and patch information. Affected products include: Amd Epyc 7763 Firmware, Amd Epyc 7763, Amd Epyc 7713P Firmware, Amd Epyc 7713P, Amd Epyc 7713 Firmware.