Vulnerability in AMD Athlon™ Series
CVE-2021-26339
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
Public proof-of-concept exploits
References
- www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027 (Vendor Advisory)
- www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-26339?
- CVE-2021-26339 is a medium-severity vulnerability in AMD Athlon™ Series. CVSS score: 5.5/10. Published 2022-05-11.
- How severe is CVE-2021-26339?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-26339 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.