CVE-2025-63913Public exploit

System crash via zero PMU counter mask

Published Jul 27, 2026 · Updated Jul 27, 2026

Input validation failure in OpenSBI 1.3 through 1.6 allows local users controlling S-mode software to crash the system via a PMU call. The sbi_pmu_ctr_cfg_match path accepts a zero counter_idx_mask, derives counter index 63, reads active_events out of bounds, and writes nonexistent CSR 0xb3f. Control of privileged S-mode or HS-mode software is required, and the resulting M-mode firmware crash interrupts the entire system without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.26%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Input validation failure in OpenSBI 1.3 through 1.6 allows local users controlling S-mode software to crash the system via a PMU call. The sbi_pmu_ctr_cfg_match path accepts a zero counter_idx_mask, derives counter index 63, reads active_events out of bounds, and writes nonexistent CSR 0xb3f. Control of privileged S-mode or HS-mode software is required, and the resulting M-mode firmware crash interrupts the entire system without reported data disclosure or modification.

The record

CVE
CVE-2025-63913
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo