Microsoft 365 Apps for Enterprise/Access/Office/Office LTSC stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1$0-$5k1.19

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft 365 Apps for Enterprise, Access, Office and Office LTSC. The affected element is an unknown function. This manipulation causes stack-based overflow. This vulnerability is registered as CVE-2026-64919. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability was found in Microsoft 365 Apps for Enterprise, Access, Office and Office LTSC (the affected version is unknown). It has been declared as problematic. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.

It is possible to read the advisory at msrc.microsoft.com. This vulnerability is known as CVE-2026-64919 since 07/20/2026. The exploitation appears to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/12/2026).

The vulnerability scanner Nessus provides a plugin with the ID 334625 (Security Updates for Microsoft Access Products (August 2026)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (334625). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 334625
Nessus Name: Security Updates for Microsoft Access Products (August 2026)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/20/2026 CVE reserved
08/11/2026 +22 days Advisory disclosed
08/11/2026 +0 days VulDB entry created
08/12/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-64919 (🔒)
GCVE (CVE): GCVE-0-2026-64919
GCVE (VulDB): GCVE-100-388735

Entryinfo

Created: 08/11/2026 23:52
Updated: 08/12/2026 04:29
Changes: 08/11/2026 23:52 (52), 08/12/2026 04:29 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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