CVE-2017-0262 is a remote code execution vulnerability in Microsoft Office. CISA added it to the Known Exploited Vulnerabilities catalogue on 10 February 2022, which means attackers have used it in real attacks. A remote code execution vulnerability exists in Microsoft Office.
What Makes This Vulnerability Dangerous in Microsoft Office
CVE-2017-0262 is dangerous because Microsoft Office is a high-trust desktop platform that routinely opens documents from email, shared drives, and external partners. When an attacker can trigger remote code execution through that workflow, a single file can become the entry point for full host compromise.
The practical risk is not just that code runs, but that it runs in the context of a user who is already trusted by the environment. That can let malicious content reach local data, browser sessions, internal documents, and any credentials or tokens available to the infected workstation.
How Exposure Is Usually Assessed
Organisations should first confirm where Microsoft Office is installed and which endpoints can receive untrusted documents from outside the business. Exposure is often broader than the software inventory suggests, because a vulnerable desktop may still be reachable through email attachment handling, shared file locations, or browser-based download paths.
For a CVE like this, the authoritative starting points are the vendor advisory and the CISA Known Exploited Vulnerabilities catalogue. The NIST National Vulnerability Database helps with canonical CVE context, while the CVE Program provides the official vulnerability record structure used to track the issue across security tooling and advisories.
Remediation and Compensating Controls
The preferred remediation is to apply the vendor’s fix as soon as the affected estate can support it. Until then, reduce exposure by limiting how Office opens files from untrusted sources, tightening email attachment handling, and restricting who can exchange documents with externally sourced macros, embedded objects, or scripts.
Where immediate patching is not possible, organisations should add compensating controls that lower the chance of execution and reduce blast radius if a malicious document is opened. That usually means stronger endpoint hardening, safer document handling policy, and closer control over user privilege on workstations that process inbound content.
Detection and Post-Exploitation Review
After a known exploited Office RCE is disclosed, defenders should review endpoint telemetry for suspicious Office child processes, unusual document opens, script spawning, and follow-on activity such as persistence, lateral movement, or credential theft. The goal is to determine not only whether the vulnerability is still present, but whether it was already used to gain a foothold.
Post-patch review matters because exploitation may leave behind staged payloads, malicious startup artefacts, or compromised user contexts even after the software issue is fixed. If there is any sign of exploitation, validate nearby accounts, sessions, and sensitive documents that the affected endpoint could access.
Risk and Threat Considerations
A remote code execution flaw in Microsoft Office creates a direct initial-access path for phishing, malicious attachments, and document-based delivery chains. Because Office is so widely trusted, attackers often use these bugs to turn ordinary business communication into a reliable compromise vector.
Failure mechanism: A user opens a crafted document and the Office process executes attacker-controlled code, which can then load additional payloads, establish persistence, or steal data from the endpoint.
Impact: Successful exploitation can lead to workstation compromise, credential theft, internal pivoting, and wider incident response costs if the initial foothold is not quickly contained.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | Vulnerability patching and remediation directly govern this exploited Office CVE. |
| SI-3 — Malicious Code Protection | Office document delivery is a common malware entry path for remote code execution. | |
| AC-6 — Least Privilege | Limiting user privilege reduces the impact of code execution on a compromised workstation. | |
| Recommendation — Prioritise SI-2 remediation for affected Office endpoints and verify fix deployment. Strengthen SI-3 to block or detonate suspicious Office documents before execution. Apply AC-6 to limit the permissions available to Office-running user sessions. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | This CVE requires asset coverage, exposure review, and patch prioritisation. |
| CIS-10 — Malware Defenses | Malicious Office documents are a primary delivery mechanism for code execution. | |
| Recommendation — Use CIS-7 to inventory affected Office assets and drive rapid remediation. Use CIS-10 to inspect and block suspicious Office-based payload delivery. | ||
Practitioner Guidance
Why practitioners should care: Treat exploited Office RCEs as exposure-management issues, not just patch tickets. If the asset can open untrusted content, the vulnerability can become an organisation-wide delivery mechanism, especially where the same document flows reach many users.
What to watch for: Prioritise systems that frequently ingest external documents, high-value user workstations, and machines with access to sensitive mailboxes, shares, or internal portals. Those endpoints are the most useful hunting ground for both remediation and compromise review.
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org