CVE-2018-8133
HighExploitedPublic exploitChakraCore RCE Vulnerability
Published May 13, 2022 · Updated Aug 27, 2026 · Also known as GHSA-8rqh-8726-83h7
Key Facts
Patch immediately- CVE-2018-8133 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting ChakraCore (Microsoft), Edge (Microsoft), Microsoft.ChakraCore (nuget).
- It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021. Public exploit code is available.
- EPSS estimates a 51% probability of exploitation in the next 30 days.
- Fixed versions are available, including ChakraCore <=1.8.3, Microsoft.ChakraCore 1.8.4, ChakraCore 1.8.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
51%
Higher than 98.9% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2018-8133 brief as a PDF
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Description
A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-0943, CVE-2018-8130, CVE-2018-8145, CVE-2018-8177.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 17, 2021 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ChakraCoreMicrosoft | >= ChakraCore | 1.8.3 |
| EdgeMicrosoft | >= Windows 10 for 32-bit Systems | n/a |
| Microsoft.ChakraCorenuget | See advisory | 1.8.4 |
Patched Releases
ChakraCore
<=1.8.3
Microsoft.ChakraCore
1.8.4
Timeline
Added to Industry KEV feed
Aug 17, 2021
Publicly disclosed
May 13, 2022
Last updated
Aug 27, 2026
Weakness Type
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
References
- advisoryGHSA advisory
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2018-8133
- advisory103982
- advisory1040844
- exploitVulnCheck exploitation report
FAQ
Common Questions.
A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore.
Affected: ChakraCore (Microsoft) versions >= ChakraCore; Edge (Microsoft) versions >= Windows 10 for 32-bit Systems; Microsoft.ChakraCore (nuget). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including ChakraCore <=1.8.3, Microsoft.ChakraCore 1.8.4, ChakraCore 1.8.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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