CVE-2021-31177
HIGHCVSS 7.8/10EPSS 3.07%
Last modified
CVE-2021-31177 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Microsoft Office Remote Code Execution Vulnerability. EPSS estimates a 3.07% chance of exploitation in the next 30 days.
Description
Microsoft Office Remote Code Execution Vulnerability
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | 365 Apps | All versions | — |
| Microsoft | Excel | 2013 | Sp1 |
| Microsoft | Excel | 2016 | — |
| Microsoft | Office | 2013 | Sp1 |
| Microsoft | Office | 2016 | — |
| Microsoft | Office | 2019 | — |
| Microsoft | Office Online Server | All versions | — |
| Microsoft | Office Web Apps Server | 2013 | Sp1 |
| Microsoft | Word | 2013 | Sp1 |
| Microsoft | Word | 2016 | — |
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31177Patch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-576/Third Party Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31177Patch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-576/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-31177?
Microsoft Office Remote Code Execution Vulnerability
How severe is CVE-2021-31177?
CVE-2021-31177 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 3.07% probability of exploitation in the next 30 days.
How do I fix CVE-2021-31177?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
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- CVE-2021-31174Microsoft Excel Information Disclosure Vulnerability5.5
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- CVE-2021-31180Microsoft Office Graphics Remote Code Execution Vulnerabilit…7.8
- CVE-2021-31181Microsoft SharePoint Remote Code Execution Vulnerability8.8
- CVE-2021-31182Microsoft Bluetooth Driver Spoofing Vulnerability7.1
Are you affected by CVE-2021-31177?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST