# CVE-2017-8662: Microsoft Edge Information Disclosure Vulnerability

CVE-2017-8662 is fixed in 2 products on 1 platform, first by KB4034674, released August 8, 2017. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2017-8662
- Priority: Urgent
- CVSS: 4.3 (Important)
- EPSS: 0.0550
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Aug 8, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-8662

## Description

<p>An information disclosure vulnerability for Microsoft Edge exists as a result of how strings are validated in specific scenarios, which can allow an attacker to read sensitive data from memory and thereby potentially bypass <a href="https://technet.microsoft.com/en-us/library/security/dn848375.aspx#ASLR">Address Space Layout Randomization (ASLR)</a>. By itself, this vulnerability does not allow arbitrary code execution. However, an attacker could use this vulnerability in conjunction with another vulnerability, such as a remote code execution vulnerability, to run arbitrary code on a target system.</p> <p>Successful exploitation of the vulnerability requires a user to be logged on and running an affected version of Microsoft Edge. The user would then need to browse to a malicious site.</p> <p>The security update addresses the vulnerability by helping to ensure that Microsoft Edge properly validates strings in affected scenarios.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems | 15063.540 | [KB4034674](https://patchblox.com/security/data/fix/microsoft/kb4034674.md) | Aug 8, 2017 |
| Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems | 15063.540 | [KB4034674](https://patchblox.com/security/data/fix/microsoft/kb4034674.md) | Aug 8, 2017 |

---

Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo