Microsoft Windows
CVE-2018-8319 — MSR JavaScript Cryptography Library Security Feature Bypass Vulnerability
Executive Summary
A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the library’s Elliptic Curve Cryptography (ECC) implementation. An attacker could potentially abuse these bugs to learn information about a server’s private ECC key (a key leakage attack) or craft an invalid ECDSA signature that nevertheless passes as valid. The security update addresses the vulnerability by fixing the bugs disclosed in the ECC implementation. In addition, an internal review resulted in other improvements to prevent rare failures in ECDH and ECDSA when using the NUMS curves.
Overview
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
EPSS Score
0.07035
probability of exploitation in the next 30 days
0.93607 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
1 affected product
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Research JavaScript Cryptography Library V1.4 | Release Details (Security Update) |
Important | Security Feature Bypass | Maybe |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
Release Details |
Security Update | Maybe |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
References
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