What is the CVSS score of CVE-2023-21716?

CVE-2023-21716 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 82.3%.

Is there a public PoC exploit available for CVE-2023-21716?

Yes, a public proof-of-concept exploit is available for CVE-2023-21716. Prioritise patching immediately. EPSS: 82.3%.

Is there a patch available for CVE-2023-21716?

Yes, a patch is available for CVE-2023-21716. Update the affected software to the latest version immediately.

Word CVE-2023-21716

CRITICAL

Integer Overflow or Wraparound (CWE-190)

2023-02-14 secure@microsoft.com

RCE Integer Overflow Microsoft Office Office Long Term Servicing Channel Office Online Server Sharepoint Enterprise Server Sharepoint Server Word Office Web Apps Sharepoint Foundation

9.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-190 ASVS 5.0 V15 - Secure Coding and Architecture Integer overflow checks MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	A remote attacker could cause unexpected behavior through arithmetic overflow by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 82.3% exploitation probability (EPSS)

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AnalysisAI

Microsoft Word Remote Code Execution Vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate arithmetic operations, use safe integer libraries, check bounds before allocation.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Technical ContextAI · show details

This vulnerability is classified as Integer Overflow (CWE-190), which allows attackers to cause unexpected behavior through arithmetic overflow. Affected products include: Microsoft Office, Microsoft Office Long Term Servicing Channel, Microsoft Office Online Server, Microsoft Office Web Apps, Microsoft Sharepoint Enterprise Server.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

Microsoft Word Remote Code Execution Vulnerability

Threat Intelligence Overview

Threat Score

5.9/10

Composite threat intelligence

EPSS Score

82.3%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

VulDB

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 CRITICAL

CISA KEV No

Public POC Yes

EPSS 82.3%

Patch available Yes

Active threat Yes

Deciding rule

CRITICAL severity + public POC available

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

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

151

Low Medium High Critical

KEV: 0

EPSS: +82

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Integer Overflow MEDIUM

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:a:microsoft:office:2019:*:*:*:*:macos:*:*

cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*

cpe:2.3:a:microsoft:office_online_server:2016:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:office_web_apps:2013:sp1:*:*:*:*:*:*

cpe:2.3:a:microsoft:sharepoint_enterprise_server:2013:sp1:*:*:*:*:*:*

cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*

cpe:2.3:a:microsoft:sharepoint_server:-:*:*:*:subscription:*:*:*

cpe:2.3:a:microsoft:sharepoint_server:-:language_pack:*:*:subscription:*:*:*

cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:word:2013:sp1:*:*:*:*:*:*

cpe:2.3:a:microsoft:word:2013:sp1:*:*:rt:*:*:*

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References

Advisories & patches

PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21716 ADVISORY https://vuldb.com/vuln/220993

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