Security readout for executives and security teams
Plain-English summary
CVE-2021-30919 is an Apple PDF-processing memory corruption issue. If a user or system processes a maliciously crafted PDF on an affected Apple platform, it may lead to arbitrary code execution. Apple says it fixed the issue with improved input validation in multiple 2021 operating system updates.
Executive priority
Prioritize remediation as a high-risk endpoint exposure because the stated impact is arbitrary code execution through a common document format. The urgency is lower than known-exploited Apple zero-days because the provided sources do not confirm active exploitation, but unpatched devices handling PDFs remain a meaningful business risk.
Technical view
The vulnerability is described as an out-of-bounds write triggered during processing of a crafted PDF. The public record does not provide CVSS, CWE, vulnerable version ranges, or detailed component internals. Fixed releases include iOS/iPadOS 15.1 and 14.8.1, macOS Monterey 12.0.1, Big Sur 11.6.1, Catalina Security Update 2021-007, tvOS 15.1, and watchOS 8.1.
Likely exposure
Exposure is most likely on Apple endpoints or devices that can open or preview PDFs and have not received the listed Apple security updates. Exact affected version ranges are not provided in the bundle, so inventory should focus on confirming installed Apple OS versions against Apple’s fixed releases.
Exploitation context
The source bundle says processing a maliciously crafted PDF may lead to arbitrary code execution. It does not show CISA KEV listing, active exploitation, public exploit availability, or exploitation in the wild. Treat malicious PDF delivery as the plausible attack path, but avoid assuming confirmed exploitation.
Researcher notes
Public details are limited. The record identifies an out-of-bounds write, PDF processing trigger, and Apple’s input-validation fix, but omits vulnerable version ranges, exploit primitives, CVSS, and CWE. ZDI is referenced, but the bundle does not provide advisory contents beyond the URL.
Mitigation direction
- Update Apple devices to the fixed OS or security update versions listed by Apple.
- Prioritize managed Macs, iPhones, and iPads that routinely handle external PDFs.
- Check Apple advisories for any newer superseding security updates.
- Restrict untrusted PDF handling where patching is delayed.
- Ensure endpoint protections inspect email and web-delivered PDF content.
Validation and detection
- Inventory Apple OS versions across managed devices.
- Compare installed versions to Apple’s fixed releases for this CVE.
- Confirm Catalina systems have Security Update 2021-007 or later.
- Review vulnerability scanner results for CVE-2021-30919 coverage.
- Verify PDF-handling endpoints are included in patch compliance reporting.
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.
Execution 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-2021-30919 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/HT212869CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212871CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212872CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212867CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212868CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212874CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212876CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-22-357/CVE reference · x_refsource_MISC
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.