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Vulnerability details: VCID-3yad-w6wx-hbdp
Vulnerability ID VCID-3yad-w6wx-hbdp
Aliases CVE-2018-8543
GHSA-h9cr-2hcf-cg8p
Summary Out-of-bounds Write 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-2018-8541, CVE-2018-8542, CVE-2018-8551, CVE-2018-8555, CVE-2018-8556, CVE-2018-8557, CVE-2018-8588.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-787 Out-of-bounds Write
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.179 https://api.first.org/data/v1/epss?cve=CVE-2018-8543
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-h9cr-2hcf-cg8p
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore
generic_textual HIGH https://github.com/chakra-core/ChakraCore
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore/commit/ef75eace57c0754428699485f10970ca0fb7a54d
generic_textual HIGH https://github.com/chakra-core/ChakraCore/commit/ef75eace57c0754428699485f10970ca0fb7a54d
cvssv3.1 7.5 https://github.com/chakra-core/ChakraCore/pull/5827
generic_textual HIGH https://github.com/chakra-core/ChakraCore/pull/5827
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-8543
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2018-8543
cvssv3.1 7.5 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8543
generic_textual HIGH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8543
cvssv3.1 7.5 https://web.archive.org/web/20210730063716/http://www.securityfocus.com/bid/105846
generic_textual HIGH https://web.archive.org/web/20210730063716/http://www.securityfocus.com/bid/105846
cvssv3.1 7.5 https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
generic_textual HIGH https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2018-8543
https://github.com/chakra-core/ChakraCore
https://github.com/chakra-core/ChakraCore/commit/ef75eace57c0754428699485f10970ca0fb7a54d
https://github.com/chakra-core/ChakraCore/pull/5827
https://web.archive.org/web/20210730063716/http://www.securityfocus.com/bid/105846
https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
http://www.securityfocus.com/bid/105846
http://www.securitytracker.com/id/1042107
CVE-2018-8543 https://nvd.nist.gov/vuln/detail/CVE-2018-8543
CVE-2018-8543 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8543
GHSA-h9cr-2hcf-cg8p https://github.com/advisories/GHSA-h9cr-2hcf-cg8p
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/chakra-core/ChakraCore
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/chakra-core/ChakraCore/commit/ef75eace57c0754428699485f10970ca0fb7a54d
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/chakra-core/ChakraCore/pull/5827
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-8543
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8543
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20210730063716/http://www.securityfocus.com/bid/105846
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20211126224439/http://www.securitytracker.com/id/1042107
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.9526
EPSS Score 0.179
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T20:54:31.570197+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/Microsoft.ChakraCore/CVE-2018-8543.yml 38.6.0