cbcvebase.
CVE-2018-8291
published 2018-07-11

CVE-2018-8291: A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers, aka "Scripting Engine Memory…

PriorityP268high7.5CVSS 3.0
AVNACHPRNUIRSUCHIHAH
EXPLOIT
EPSS
70.03%
99.3th percentile
A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore, Internet Explorer 11, Microsoft Edge. This CVE ID is unique from CVE-2018-8242, CVE-2018-8283, CVE-2018-8287, CVE-2018-8288, CVE-2018-8296, CVE-2018-8298.

Affected

8 ranges
VendorProductVersion rangeFixed in
microsoftchakracore< 1.10.11.10.1
microsoftchakracore
microsoftinternet_explorer
microsoftinternet_explorer
microsoftinternet_explorer
msrcchakracore
msrcinternet_explorer_11
msrcmicrosoft_edge

Detection & IOCsextracted from sources · hover to see the quote

  • PoC trigger pattern: global Let/Const declaration shadowing a global object property (e.g., 'let x = 1; this.x = 0x1234;') followed by a loop adding many properties to force BigDictionaryTypeHandler conversion, then reading the shadowed property — flag this JS pattern in browser script analysis
  • ·Exploit status at time of advisory was 'Publicly Disclosed: No; Exploited: No' but rated 'Exploitation More Likely' for the latest software release — no in-the-wild exploitation confirmed at disclosure time

CVSS provenance

nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv2.07.6HIGHAV:N/AC:H/Au:N/C:C/I:C/A:C
ghsa7.5HIGH
osv7.5HIGH
vendor_msrc4.2MEDIUM
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