CVE & CISA-KEV Catalog

CVE-2025-21090

MEDIUM
6.5
CVSS v3
NVD

Description

Missing reference to active allocated resource for some Intel(R) Xeon(R) processors may allow an authenticated user to potentially enable denial of service via local access.

CWE-771

How to fix

Remediation Available
intel-microcodeDebian
Fixed in:3.20250812.1~deb11u1CVE-2025-21090
Fixed in:3.20250812.1~deb12u1CVE-2025-21090
Fixed in:3.20250812.1~deb13u1CVE-2025-21090
Fixed in:3.20250812.1CVE-2025-21090
intel-microcodeUbuntu
Fixed in:3.20250812.0ubuntu0.16.04.1+esm1USN-7866-1
Fixed in:3.20250812.0ubuntu0.18.04.1+esm1USN-7866-1
Fixed in:3.20250812.0ubuntu0.20.04.1+esm1USN-7866-1
Fixed in:3.20250812.0ubuntu0.22.04.1USN-7866-1
Fixed in:3.20250812.0ubuntu0.24.04.1USN-7866-1
Fixed in:3.20250812.0ubuntu0.25.10.1USN-7866-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

0.14%probability of exploitation in 30 days
4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-771 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2021-34720High8.61.3%-Fix
CVE-2026-3039High7.51.0%-Fix
CVE-2023-20244High8.60.8%--
CVE-2024-56343Medium4.30.3%--
CVE-2026-20004High7.40.2%--

Common questions

How do I fix CVE-2025-21090?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2025-21090 being actively exploited?

Not that we know of. CVE-2025-21090 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.14% is the estimated probability that it will be exploited in the next 30 days. That is higher than 4% of all scored CVEs.

How severe is CVE-2025-21090?

CVE-2025-21090 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-21090 affect?

Published advisories record a fix for intel-microcode (Debian), intel-microcode (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.