Integer overflow in AMD Athlon™ 3000 Series Mobile Processors With Radeon™ Graphics

CVE-2021-26377

Insufficient parameter validation while allocating process space in the Trusted OS (TOS) may allow for a malicious userspace process to trigger an integer overflow, leading to a potential denial of service.

Vulnerability class: Integer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (3.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-26377: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-26377?
CVE-2021-26377 is a medium-severity vulnerability in AMD Athlon™ 3000 Series Mobile Processors With Radeon™ Graphics, classified under Integer Overflow or Wraparound. CVSS score: 4.1/10. Published 2025-09-06.
How severe is CVE-2021-26377?
Medium severity. CVSS v3 base score is 4.1 out of 10.
Is CVE-2021-26377 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.