CVE-2025-21354

Q: How do I fix CVE-2025-21354?

Upgrade office online server to 16.0.10416.20047 or later.

Q: Is CVE-2025-21354 being actively exploited?

Not that we know of. CVE-2025-21354 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.94% is the estimated probability that it will be exploited in the next 30 days. That is higher than 58% of all scored CVEs.

Q: How severe is CVE-2025-21354?

CVE-2025-21354 has a CVSS v3 base score of 8.4, rated high. 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.

Q: What does CVE-2025-21354 affect?

Published advisories record a fix for office online server (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

8.4

CVSS v3

NVD

Description

Microsoft Excel Remote Code Execution Vulnerability

CWE-822Untrusted Pointer Dereference

How to fix

Remediation Available

office online serverNVD

Affected:< 16.0.10416.20047Fixed in:16.0.10416.20047CVE-2025-21354derived from NVD

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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.94%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Patch1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-822 (Untrusted Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21768	High	7.8	65%	-	Fix
CVE-2024-21338	High	7.8	60%	KEV + Ransom	Fix
CVE-2024-35250	High	7.8	25%	KEV	Fix
CVE-2023-29360	High	8.4	22%	KEV	Fix
CVE-2023-36033	High	7.8	12%	KEV	Fix
CVE-2025-50165	Critical	9.8	9.5%	-	Fix

Common questions

How do I fix CVE-2025-21354?

Upgrade office online server to 16.0.10416.20047 or later.

Is CVE-2025-21354 being actively exploited?

Not that we know of. CVE-2025-21354 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.94% is the estimated probability that it will be exploited in the next 30 days. That is higher than 58% of all scored CVEs.

How severe is CVE-2025-21354?

CVE-2025-21354 has a CVSS v3 base score of 8.4, rated high. 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-2025-21354 affect?

Published advisories record a fix for office online server (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2025-21354

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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 2025-08-25.