CVE-2014-1761 is a memory corruption vulnerability in Microsoft Word. CISA added it to the Known Exploited Vulnerabilities catalogue on 15 February 2022, which means attackers have used it in real attacks. Microsoft Word contains a memory corruption vulnerability which when exploited could allow for remote code execution.
What This Vulnerability Means in Microsoft Word
CVE-2014-1761 is a memory corruption flaw in Microsoft Word, which matters because word-processing files are often opened in routine business workflows and can become a delivery path for code execution. Memory corruption bugs are dangerous in this kind of product because they can turn document parsing into a direct attack surface.
For a glossary reader, the important point is that the issue is not simply that Word can crash. The vulnerability can let an attacker move from a crafted document to execution inside the victim process, which makes the user’s normal trust in an office document part of the attack path.
Why Memory Corruption in a Document Editor Is Dangerous
Document editors process complex file formats, embedded objects, fonts, scripting features, and rich content. When memory handling fails, an attacker may be able to influence program state during file parsing or rendering and convert that into code execution. That is why a seemingly ordinary office file can become a high-risk delivery vehicle.
This class of flaw is especially dangerous because the victim does not need to visit a hostile website or install software. Opening a document is often enough to trigger the vulnerable code path, which compresses the time between delivery and compromise.
When this kind of vulnerability is used in the wild, the main security concern is not the file itself but the attacker’s foothold after exploitation. A successful exploit can expose the workstation, user data, browser sessions, and any network access available to that process or user context.
How Organisations Check Exposure and Reduce Risk
Exposure assessment starts with asset inventory: identify which endpoints still run vulnerable Microsoft Word versions or have compatible document-opening paths, then determine whether they are reachable by email, file shares, collaboration tools, or other document intake channels. Organisations should also review vendor advisories and CISA KEV guidance for authoritative patch and prioritisation details rather than relying on informal summaries.
Where patching is delayed, compensating controls matter. Restrict opening of untrusted attachments, isolate risky document handling, apply application control where practical, and harden mail and web gateways so hostile documents are filtered before they reach users. These measures do not remove the flaw, but they reduce the chance that a crafted file reaches a vulnerable process.
Prioritisation should be high when the affected software is broadly deployed or exposed to external documents. The fact that CISA added this CVE to the KEV catalogue indicates known real-world exploitation, so exposure is not theoretical.
Detection and Post-Exploitation Review
Detection should focus on the document-open event followed by unusual child processes, suspicious network activity, unexpected script execution, or abnormal crashes around Word. A memory corruption exploit may leave only limited direct evidence, so defenders often need to correlate endpoint telemetry with email, download, and process-chain data.
After patching, review whether the incident may have involved credential theft, malicious add-ins, persistence, or lateral movement. If exploitation is suspected, treat the endpoint as potentially compromised and examine nearby accounts, recently accessed documents, and outbound connections for signs of follow-on activity.
For additional context on vulnerability handling and KEV-driven prioritisation, see the Vulnerability Management Guide, which covers asset scope, scanning, prioritisation, exceptions, and verification.
Risk and Threat Considerations
This CVE is dangerous because it combines a user-trust action, opening a document, with an attacker-controlled code path inside a widely used desktop application. That makes it useful for targeted intrusion, initial access, and payload delivery, especially where document exchange is routine.
Failure mechanism: A crafted file triggers memory corruption during Word’s parsing or rendering logic, allowing attacker-controlled execution in the context of the user who opened the document.
Impact: Successful exploitation can lead to remote code execution, endpoint compromise, and follow-on theft of data, credentials, or access tokens available to that user session.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Prioritises tracking and remediating exploited software flaws like this CVE. |
| CIS-10 — Malware Defenses | Supports detecting and containing payloads delivered through exploit chains. | |
| Recommendation — Prioritise and remediate KEV-listed Word exposure first. Monitor endpoints for suspicious post-exploitation behaviour. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | Calls for fixing software flaws that can be exploited for code execution. |
| SI-3 — Malicious Code Protection | Supports filtering hostile documents and reducing exploit delivery risk. | |
| Recommendation — Patch vulnerable Word installations and verify remediation. Apply document and content protections to block malicious files. | ||
| NIST CSF 2.0 | PR.PS-06 — Software, Firmware, and Information Integrity | Covers integrity of software and content handling where exploitation occurs. |
| Recommendation — Harden software intake and validate integrity of document workflows. | ||
Practitioner Guidance
Why practitioners should care: KEV-listed office-document exploits deserve fast treatment because they often bypass user intuition and arrive through standard business workflows. If Word is present on exposed endpoints, this CVE should be handled as an active exploitation risk rather than a routine stability issue.
What to watch for: Prioritise systems that routinely open external documents, especially on user workstations with broad mailbox, file-share, or collaboration access. Investigate repeated crashes, suspicious attachments, and unusual process spawning after document opening.
Practitioner takeaway: Treat document-handling software as an externally reachable attack surface, and verify both patch status and exposure paths before assuming the risk is closed.