CVE-2018-8555: Microsoft Microsoft Edge: Out-of-bounds Write

Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

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-2018-8543, CVE-2018-8551, CVE-2018-8556, CVE-2018-8557, CVE-2018-8588.

What

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

What

Why

A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.

How

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: a network path → Out-of-bounds Write → execute code or commands in the affected security context
Attack surface: Network
Privileges required: None: unauthenticated exploitation is possible
User interaction: Required interaction required
Attack complexity: High: exploitation depends on specific conditions
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-787 ↗
CWE-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended buffer.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.

NetworkUnauthenticatedRemote code executionCWE-787

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2022-3677Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

CERT-FR · French · CERTFR-2018-AVI-554Multiples vulnérabilités dans les produits Microsoft

crosoft.com/fr-FR/security-guidance Référence CVE CVE-2018-8256 https://www.cve.org/CVERecord?id=CVE-2018-8256 Référence CVE CVE-2018-8415 https://www.cve.org/CVERecord?id=CVE-2018-8415 Référence CVE CVE-2018-8529 https://www.cve.org/CVERecord?id=CVE-2018-8529 Référence CVE CVE-2018-8541 https://www.cve.org/CVERecord?id=CVE-2018-8541 Référence CVE CVE-2018-8542 https://www.cve.org/CVERecord?id=CVE-2018-8542 Référence CVE CVE-2018-8543 https://www.cve.org/CVERecord?id=CVE-2018-8543 Référence CVE CVE-2018-8546 https://www.cve.org/CVERecord?id=CVE-2018-8546 Référence CVE CVE-2018-8551 https://www.cve.org/CVERecord?id=CVE-2018-8551 Référence CVE CVE-2018-8555 https://www.cve.org/CVERecord?id=CVE-2018-8555 Référence CVE CVE-2018-8556 https://www.cve.org/CVERecord?id=CVE-2018-8556 Référence CVE CVE-2018-8557 https://www.cve.org/CVERecord?id=CVE-2018-8557 Référence CVE CVE-2018-8569 https://www.cve.org/CVERecord?id=CVE-2018-8569 Référence CVE CVE-2018-8581 https://www.cve.org/CVERecord?id=CVE-2018-8581 Référence CVE CVE-2018-8588 https://www.cve.org/CVERecord?id=CVE-2018-8588 Référence CVE CVE-2018-8600 https://www.cve.org/CVERecord?id=CVE-2018-8600 Référence CVE CVE-2018-8602 https://www.cve.org/CVERecord?id=CVE-2018-8602 Référence CVE CVE-2018-8605 https://www.cve.org/CVERecord?id=CVE-2018-8605 Ré

Official advisory ↗

CERT-FR · French · CERTFR-2018-AVI-550Multiples vulnérabilités dans Microsoft Edge

De multiples vulnérabilités ont été corrigées dans Microsoft Edge . Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données, une exécution de code à distance et une usurpation d'identité.

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010452Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8541、CVE-2018-8542、CVE-2018-8543、CVE-2018-8551、CVE-2018-8555、CVE-2018-8556、CVE-2018-8557 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010451Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010450Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8541、CVE-2018-8542、CVE-2018-8543、CVE-2018-8551、CVE-2018-8555、CVE-2018-8557、CVE-2018-8558 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010449Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8541、CVE-2018-8542、CVE-2018-8543、CVE-2018-8551、CVE-2018-8556、CVE-2018-8557、CVE-2018-8588 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010448Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8541、CVE-2018-8542、CVE-2018-8543、CVE-2018-8555、CVE-2018-8556、CVE-2018-8557、CVE-2018-8588 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010447Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8541、CVE-2018-8542、CVE-2018-8551、CVE-2018-8555、CVE-2018-8556、CVE-2018-8557、CVE-2018-8588 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010446Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8541、CVE-2018-8543、CVE-2018-8551、CVE-2018-8555、CVE-2018-8556、CVE-2018-8557、CVE-2018-8588 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-010445Microsoft Edge および ChakraCore におけるリモートでコードを実行される脆弱性

Microsoft Edge および ChakraCore には、Chakra スクリプトエンジンが Microsoft Edge のメモリ内のオブジェクトを処理する方法に不備があるため、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Chakra スクリプトエンジンのメモリ破損の脆弱性」として公開しています。本脆弱性は、CVE-2018-8542、CVE-2018-8543、CVE-2018-8551、CVE-2018-8555、CVE-2018-8556、CVE-2018-8557、CVE-2018-8588 とは異なる脆弱性です。

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-4948MS 11월 보안 위협에 따른 정기 보안 업데이트 권고

-2018-8553) - 권한상승 취약점(CVE-2018-8471, CVE-2018-8550, CVE-2018-8554, CVE-2018-8561, CVE-2018-8562, CVE-2018-8584, CVE-2018-8592, CVE-2018-8485) - 보안기능 우회 취약점(CVE-2018-8417, CVE-2018-8549, CVE-2018-8566) - 정보노출 취약점(CVE-2018-8407, CVE-2018-8408, CVE-2018-8454, CVE-2018-8565) - 악용 및 변조(CVE-2018-8415) - 스푸핑(CVE-2018-8547) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4465659, 4093430, 4465660, 4465661, 4465663, 4465664, 4467691, 4467680, 4467696, 4467686, 4467702, 4467708 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 2. Edge 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2018-8543, CVE-2018-8551, CVE-2018-8555, CVE-2018-8556, CVE-2018-8557, CVE-2018-8588, CVE-2018-8541, CVE-2018-8542) - 권한상승 취약점(CVE-2018-8567) - 스푸핑(CVE-2018-8564) - 정보노출 취약점(CVE-2018-8545) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4467708, 4467686, 4467702, 4467696, 4467691, 4467680 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 3. Windows Server 2019, 2016, Server Core(2019, 2016, v1803, v1709) 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2018-8256, CVE-2018-8450, CVE-2018-8544, CVE-2018-8553, CVE-2018-8476) - 권한상승 취약점(CVE-2018-8471, CVE-2018-8550, CVE-2018-8554, CVE-2018-8561, CVE-2018-8562, CVE-2018-8584, CVE-2018-8592, CV

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: Microsoft Edge: Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems, Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1703 for 32-bit Systems, Windows 10 Version 1703 for x64-based Systems, Windows 10 Version 1709 for 32-bit Systems, Windows 10 Version 1709 for ARM64-based Systems, Windows 10 Version 1709 for x64-based Systems, Windows 10 Version 1803 for 32-bit Systems, Windows 10 Version 1803 for ARM64-based Systems, Windows 10 Version 1803 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for ARM64-based Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2016, Windows Server 2019
ChakraCore: ChakraCore
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 14 Nov 2018 · Last source change 5 Aug 2024, 07:02 UTC · CWE-787 · Out-of-bounds Write

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-09-01

European sourceENISA EUVD · EUVD-2022-3677

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

5 Aug 2024, 07:02 UTC
Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to authoritative remediation link · patch.
Before
no authoritative guidance recorded
After
authoritative remediation link · patch
af854a3a-2127-422b-91ae-364da2661108 ↗
5 Aug 2024, 07:02 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 for 32-bit Systems; Windows 10 for x64-based Systems; Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1703 for 32-bit Systems; Windows 10 Version 1703 for x64-based Systems; Windows 10 Version 1709 for 32-bit Systems; Windows 10 Version 1709 for ARM64-based Systems · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
Windows 10 for 32-bit Systems; Windows 10 for x64-based Systems; Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1703 for 32-bit Systems; Windows 10 Version 1703 for x64-based Systems; Windows 10 Version 1709 for 32-bit Systems; Windows 10 Version 1709 for ARM64-based Systems · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
CNA ↗
5 Aug 2024, 07:02 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
af854a3a-2127-422b-91ae-364da2661108 ↗
5 Aug 2024, 07:02 UTC
SeveritySeverity changed from Unknown to High.
Before
Unknown
After
High
NIST NVD ↗
5 Aug 2024, 07:02 UTC
CVSS scoreCVSS score changed from not recorded to 7.5 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
Before
not recorded
After
7.5 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
NIST NVD ↗
1 Sept 2026, 02:42 UTC
ENISA EUVD mappingEUVD-2022-3677 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2022-3677"}
ENISA EUVD ↗
5 Aug 2024, 07:02 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2018-11-14CVE published

2024-08-05Fixed release or patch reference recorded

ENISA EUVD · EUVD-2022-3677↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Microsoft Microsoft Edge: Out-of-bounds Write

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2022-3677

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication

Microsoft Microsoft Edge: Out-of-bounds Write

National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

EUVD-2022-3677

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.