Cyber Resilience

CVE-2020-6418

Memory Safety in Fedoraproject Fedora 30 … 31

CISA KEVActive ExploitationEUVD ExploitedPublic PoCMemory Safety
Published
27 February 2020
Modified
24 October 2025
KEV Added
03 November 2021
Patch / advisory
View advisory
CVSS Score v3.1 8.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.79 99.6th percentile
Risk Priority 90 floored blend · peak EPSS

Summary

CVE-2020-6418 is a high-severity Type Confusion (CWE-843) vulnerability in Fedoraproject Fedora. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 0.4% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

The vulnerability CVE-2020-6418 is a type confusion flaw (CWE-843) in the V8 JavaScript engine of Google Chrome versions prior to 80.0.3987.122. It can result in heap corruption when the engine processes certain inputs, carrying a CVSS 3.1 base score of 8.8.

A remote attacker can trigger the issue by serving a crafted HTML page to a victim, enabling exploitation of the resulting memory corruption to potentially compromise confidentiality, integrity, and availability without requiring authentication.

Advisories and patches direct users to upgrade Chrome to 80.0.3987.122 or newer; Red Hat and Fedora have issued corresponding errata (RHSA-2020:0738 and Fedora package updates) that address the affected browser packages.

Public references include a detailed Chromium bug report and a proof-of-concept demonstrating side-effect handling during JSCreate operations that leads to the type confusion.

EU & UK References

Vulnerability Data

Type confusion in V8 in Google Chrome prior to 80.0.3987.122 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CWE(s)
CWE-843
KEV Date Added
03 November 2021

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2021-21224Same product: Debian Debian Linuxboth on KEV
CVE-2023-4762Same product: Debian Debian Linuxboth on KEV
CVE-2023-2033Same product: Debian Debian Linuxboth on KEV
CVE-2018-17480Same product: Debian Debian Linuxboth on KEV
CVE-2021-30551Same product: Fedoraproject Fedoraboth on KEV
CVE-2024-5274Same product: Fedoraproject Fedoraboth on KEV
CVE-2024-4947Same product: Fedoraproject Fedoraboth on KEV
CVE-2017-8291Same product: Debian Debian Linuxboth on KEV
CVE-2017-5070Same product: Google Chromeboth on KEV
CVE-2023-3079Same product: Debian Debian Linuxboth on KEV

Affected Assets

google
chrome
≤ 80.0.3987.122
fedoraproject
fedora
30, 31
redhat
enterprise linux desktop
6.0
redhat
enterprise linux server
6.0
redhat
enterprise linux workstation
6.0
debian
debian linux
10.0, 9.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.5.2
  • V3.2.3
  • V15.3.5

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent type-confusion flaws via safe typing, static analysis, and code review while the control itself addresses many additional weaknesses.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect type-confusion vulnerabilities through fuzzing and static analysis.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates type-safe design and review that can catch type-confusion flaws.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify strong typing and interface contracts that reduce type confusion.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles promote type-safe languages and memory-safety mechanisms that mitigate type confusion.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly forbid unsafe type casts and require static-analysis checks for type confusion.

References