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By the Year

In 2026 there have been 148 vulnerabilities in Microsoft Office 2021 with an average score of 7.3 out of ten. Last year, in 2025 Office 2021 had 141 security vulnerabilities published. That is, 7 more vulnerabilities have already been reported in 2026 as compared to last year. Last year, the average CVE base score was greater by 0.42




Year Vulnerabilities Average Score
2026 148 7.34
2025 141 7.76
2024 7 7.71
2023 0 0.00
2022 0 0.00
2021 0 0.00
2020 1 7.80

It may take a day or so for new Office 2021 vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.

Recent Microsoft Office 2021 Security Vulnerabilities

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55121 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-56195 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-56192 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-50665 7.8 - High - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-56156 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55949 7.8 - High - July 14, 2026

Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Use of Uninitialized Resource

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55947 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-55898 6.1 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-54131 7.8 - High - July 14, 2026

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

Dangling pointer

Jul 2026: Microsoft PowerPoint Remote Code Execution Vulnerability
CVE-2026-55120 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft PowerPoint Remote Code Execution Vulnerability
CVE-2026-55123 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft PowerPoint Remote Code Execution Vulnerability
CVE-2026-55043 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55139 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55042 5.5 - Medium - July 14, 2026

Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information locally.

Use of Uninitialized Resource

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55130 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55128 7.8 - High - July 14, 2026

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

Dangling pointer

Jul 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-55140 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-55142 5.5 - Medium - July 14, 2026

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Numeric Truncation Error

Jul 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-55056 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55134 7.8 - High - July 14, 2026

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

Stack Overflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55131 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55057 5.5 - Medium - July 14, 2026

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

Integer Overflow or Wraparound

Jul 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-55122 7.1 - High - July 14, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55053 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55137 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55132 7.8 - High - July 14, 2026

Double free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Double-free

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55038 7.8 - High - July 14, 2026

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

Stack Overflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55058 7.8 - High - July 14, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55037 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-55054 6.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Out-of-bounds Read

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55055 7.8 - High - July 14, 2026

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

Stack Overflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55044 7.8 - High - July 14, 2026

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55036 7.8 - High - July 14, 2026

Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Buffer Over-read

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55035 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55141 7.8 - High - July 14, 2026

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

Stack Overflow

Jul 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-55129 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55136 7.8 - High - July 14, 2026

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Untrusted Pointer Dereference

Jul 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-55124 5.5 - Medium - July 14, 2026

Improper validation of specified type of input in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Improper Validation of Specified Type of Input

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55127 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-55138 5.5 - Medium - July 14, 2026

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Untrusted Pointer Dereference

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55041 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55032 7.8 - High - July 14, 2026

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

Dangling pointer

Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55033 7.8 - High - July 14, 2026

Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Integer Overflow or Wraparound

Jul 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-55049 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Office Remote Code Execution Vulnerability
CVE-2026-55045 8.4 - High - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.

Out-of-bounds Read

Jul 2026: Microsoft Word Information Disclosure Vulnerability
CVE-2026-55050 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55047 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55039 7.8 - High - July 14, 2026

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Integer underflow

Jul 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-55029 7.8 - High - July 14, 2026

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

Heap-based Buffer Overflow

Jul 2026: Microsoft Office Information Disclosure Vulnerability
CVE-2026-55028 5.5 - Medium - July 14, 2026

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Out-of-bounds Read

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