CVE-2025-62863: amperecomputing ampereone_a128-34x_firmware Out-of-bounds Write
CVSS: 9.8v3.1CriticalAnalyzed
Published 16-12-2025Last modified 17-12-2025
Vulnerability summary
CVE-2025-62863 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in amperecomputing ampereone_a128-34x_firmware. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 28.9% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
0.36%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 16-12-2025PublishedVulnerability first disclosed.
- 17-12-2025Last modifiedVulnerability information updated.
Description
Ampere AmpereOne AC03 devices before 3.5.9.3, AmpereOne AC04 devices before 4.4.5.2, and AmpereOne M devices before 5.4.5.1 allow an incorrectly formed SMC call to UEFI-MM PCIe driver that could result in an out-of-bounds write within PCIe driver’s S-EL0 address space.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.36%
Chance of exploitation in the next 30 days
Percentile
29%
Versus all other CVEs
30-day change
0.00 pp
From 0.36% on 20-09-2026
20-09-202620-10-2026
EPSS score0.36%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Amperecomputing13 products
- ampereone_a128-34x_firmware< 4.4.5.2
- ampereone_a144-24x_firmware< 4.4.5.2
- ampereone_a144-26m_firmware< 5.4.5.1
- ampereone_a144-27x_firmware< 4.4.5.2
- ampereone_a144-33m_firmware< 5.4.5.1
1 vendor · 13 products
References
2 links- amperecomputing.com/products/product-securityVendor Advisory
- amperecomputing.com/products/security-bulletins/amp-sb-0007Vendor Advisory