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CVE-2017-8658

40
FAUCET Score

CVE-2017-8658 is a critical remote code execution vulnerability affecting Microsoft's Chakra JavaScript engine, stemming from memory corruption during object rendering. With a CVSS score of 9.8, it poses a severe risk, allowing unauthenticated attackers to achieve full compromise (confidentiality, integrity, availability) with low attack complexity. Despite its high severity and EPSS score, there is no evidence of active exploitation, public exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.7.0CPE matchmatch criteria
cpe:2.3:a:microsoft:chakracore:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
20.07%
Probability of exploitation in next 30 days
EPSS Percentile
97.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2007 is in the 94th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: ChakraCore
View patch
nugetpatch availablevia ghsa
Product: Microsoft.ChakraCoreFixed in: 1.6.1

Vendor Advisories (2)

nugetGHSA-8v2h-4jpm-3wfmcritical

ChakraCore RCE Vulnerability

May 17, 2022
microsoft2017-Aug/CVE-2017-8658Critical

Scripting Engine Memory Corruption Vulnerability

Aug 8, 2017

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2017-8658
PatchVendor Advisory
securityfocus.com / bid/100036
Third Party AdvisoryVDB Entry