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Office CVE-2025-49711

| EUVDEUVD-2025-20628 HIGH
Use After Free (CWE-416)
2025-07-08 secure@microsoft.com
Denial Of Service Use After Free Memory Corruption Microsoft 365 Apps Excel Office Office Long Term Servicing Channel Office Online Server
7.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-416
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

Memory corruption that can be exploited for arbitrary code execution, information disclosure, or denial of service. With a CVSS score of 7.8 (HIGH), this represents a significant risk.
Exploit ScenarioDerived

An attacker triggers a specific sequence of operations that causes the application to free a memory block and then reference it again, potentially executing attacker-controlled data.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisCVE.org

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

RemediationAI

Use memory-safe languages. Implement proper object lifecycle management. Use static and dynamic analysis tools to detect UAF patterns.

Affected VersionsENISA

Microsoft Office 2019 19.0.0 <https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2021 N/A
Microsoft Office LTSC for Mac 2024 1.0.0 <16.99.25071321
Microsoft Office LTSC 2024 1.0.0 <https://aka.ms/OfficeSecurityReleases
Office Online Server 1.0.0 <16.0.10417.20027
Microsoft Office LTSC 2021 16.0.1 <https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2021 16.0.1 <16.99.25071321
Microsoft Office LTSC for Mac 2024 N/A
Microsoft 365 Apps for Enterprise 16.0.1 <https://aka.ms/OfficeSecurityReleases
Microsoft Excel 2016 16.0.0.0 <16.0.5508.1001

Affected Packages

euvd microsoft_excel_2016 fix: 16.0.5508.1001
euvd microsoft_office_ltsc_for_mac_2021 fix: 16.99.25071321
euvd microsoft_office_ltsc_for_mac_2024 fix: 16.99.25071321
euvd office_online_server fix: 16.0.10417.20027

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 4 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

A use-after-free vulnerability occurs when a program continues to use a pointer after the referenced memory has been freed, leading to undefined behavior. This vulnerability is classified as Use After Free (CWE-416).

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Updated
Apr 16, 2026 - 06:29 EUVD-patch-fix
executive summary
Patch available
Apr 16, 2026 - 05:29 EUVD
16.99.25071321,16.0.10417.20027,16.0.5508.1001
CVE Published
Jul 08, 2025 - 17:15 nvd
HIGH 7.8

Executive ViewAI

Why It Matters

CVE-2025-49711 is a use-after-free vulnerability in Microsoft Office Excel that permits local code execution by unauthorized attackers. This poses a direct threat to any organization using Excel, as successful exploitation could allow threat actors to compromise workstations and establish persistence without requiring user credentials. Immediate patching is critical given the high severity rating and likelihood of rapid weaponization.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.1%
Top 78% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
High

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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References

Advisories & patches
ADVISORY https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49711 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-49711

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