Security readout for executives and security teams
Plain-English summary
This Apple vulnerability could let an application run code with kernel privileges, the highest level on a device. Apple says it was a memory corruption issue fixed through improved memory handling. Because CISA lists it as known exploited, organizations should treat unpatched Apple devices as urgent legacy risk.
Executive priority
Prioritize remediation where legacy Apple devices still exist. KEV listing makes this more than a theoretical issue, but the available evidence points to patch verification rather than emergency incident response unless vulnerable devices are present.
Technical view
CVE-2020-3837 is a CWE-787 out-of-bounds write / memory corruption issue affecting Apple platforms. The CVSS 3.1 score is 7.8 with local attack vector, low complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact. Successful exploitation may allow arbitrary code execution with kernel privileges.
Likely exposure
Exposure is most likely on Apple devices not updated to iOS/iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, or watchOS 6.1.2. The bundle does not provide exact vulnerable version ranges or affected hardware models.
Exploitation context
CISA KEV status indicates known exploitation. The provided sources do not describe exploit details, exploited campaigns, attacker groups, or whether exploitation remains common in current environments.
Researcher notes
The record lacks subsystem details, affected build ranges, proof-of-concept status, and exploit-chain context. Treat the Apple fixed-version advisories and CISA KEV listing as the authoritative exposure signals in this bundle.
Mitigation direction
- Update affected Apple devices to the fixed versions or later.
- Prioritize internet-facing, executive, developer, and high-privilege user devices.
- Check Apple advisory pages for any newer vendor guidance.
- Retire or isolate devices that cannot receive supported Apple updates.
Validation and detection
- Inventory Apple OS versions across managed and unmanaged devices.
- Confirm iOS/iPadOS 13.3.1 or later where applicable.
- Confirm macOS Catalina 10.15.3 or later where applicable.
- Confirm tvOS 13.3.1 and watchOS 6.1.2 or later where applicable.
- Review MDM compliance and exception reports for unsupported devices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-787: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3837 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/HT210919CVE reference · x_refsource_MISC
- https://support.apple.com/HT210918CVE reference · x_refsource_MISC
- https://support.apple.com/HT210921CVE reference · x_refsource_MISC
- https://support.apple.com/HT210920CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3837CVE 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.