Security readout for executives and security teams
Plain-English summary
CVE-2020-16017 is a critical Chrome sandbox escape issue. If an attacker already compromises Chrome’s renderer process, a crafted web page could help them break out of the browser sandbox. That raises business risk because browser sandbox escapes are commonly useful in chained attacks against employee workstations.
Executive priority
Treat this as urgent for legacy or unmanaged browser fleets. The vulnerability is old but KEV-listed, critical, and relevant to workstation compromise through browser exploit chains.
Technical view
The issue is a CWE-416 use-after-free in Chrome Site Isolation before 86.0.4240.198. The CVSS 3.1 score is 9.6 with network attack vector, low complexity, required user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely limited to systems running Google Chrome versions before 86.0.4240.198. The source bundle identifies Google Chrome as affected, but does not name Chromium-based downstream products or platform-specific ranges.
Exploitation context
CISA lists CVE-2020-16017 in the Known Exploited Vulnerabilities catalog, supporting known exploitation. The provided description requires a compromised renderer process and a crafted HTML page, so practical attacks likely involve chaining with another browser vulnerability.
Researcher notes
Do not assess this as a standalone remote code execution issue from the provided text. The source says sandbox escape after renderer compromise, so validation should focus on vulnerable Chrome versions and exposure to chained browser attacks.
Mitigation direction
- Update Google Chrome to 86.0.4240.198 or later.
- Prefer the current stable Chrome release where operationally possible.
- Enforce browser auto-update through endpoint management.
- Prioritize unmanaged or internet-facing user workstations.
- Check Google and CISA guidance for any additional directives.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Flag any Chrome installation below 86.0.4240.198.
- Confirm auto-update policy is enabled and functioning.
- Review vulnerability scanner results for CVE-2020-16017.
- Check CISA KEV tracking for remediation requirements.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-16017 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H2.86Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://chromereleases.googleblog.com/2020/11/stable-channel-update-for-desktop_11.htmlCVE reference · x_refsource_MISC
- https://crbug.com/1146709CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-16017CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.