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CVE-2025-63913: An issue was discovered in OpenSBI 1.3 allowing attackers to cause a denial of service via crafted request to the SBI function #2 or the 'Find and configure a matching counter' function of SBI PMU extension.

CVE-2025-63913 is a vulnerability in An issue was discovered in OpenSBI 1.3 allowing attackers to cause a denial of service via crafted request to the SBI function #2 or the 'Find and configure a matching counter' function of SBI PMU extension., rated Moderate by Microsoft, with a CVSS 3.1 base score of 7.5 (High). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.46% probability of exploitation activity in the next 30 days, higher than 40% of all scored vulnerabilities. Microsoft published it on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).

Key facts

CVE ID
CVE-2025-63913
Severity
High CVSS 7.5
Microsoft severity
Moderate
Exploited in the wild
No
Publicly disclosed
No
Weakness
CWE-400
EPSS
0.46% (percentile 40%)
CISA KEV
Not listed
Released
Last updated
Patch Tuesday
July 2026 Patch Tuesday
Product families
Open Source Software

CVSS score and vector

Microsoft scores CVE-2025-63913 at 7.5 (temporal 6.9) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U

MetricValue
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit code maturityUnproven

Affected products (1)

Open Source Software

ProductSecurity updateTypeFixed buildRestart
azl3 qemu 9.1.0-11 on Azure Linux 3.0

NIST NVD data

NVD status
Deferred
NVD CVSS
7.5 (HIGH)
NVD weakness
CWE-400
Published to NVD
NVD last modified

References

Revision history

VersionDateDescription
1.0Information published.

Sources