Security readout for executives and security teams
Plain-English summary
CVE-2025-43520 is an Apple operating system memory corruption flaw. A malicious app could crash the system or write to kernel memory. Apple fixed it across iPhone, iPad, Mac, Apple TV, Vision Pro, and Apple Watch platforms. Business urgency is moderate because exploitation requires local app execution, but kernel impact increases concern.
Executive priority
Patch during the next standard Apple update cycle, sooner for high-risk users or unmanaged devices. This is not currently KEV-listed, but kernel memory impact means delayed patching can create avoidable operational and security risk.
Technical view
Apple describes a CWE-120 memory corruption issue fixed with improved memory handling. CVSS is 5.5: local attack vector, low complexity, low privileges, no user interaction, high availability impact. Fixed releases include iOS/iPadOS 18.7.2 and 26.1, macOS Sequoia 15.7.2, Sonoma 14.8.2, Tahoe 26.1, tvOS 26.1, visionOS 26.1, and watchOS 26.1.
Likely exposure
Organizations with Apple devices below the listed fixed releases may be exposed. The practical risk is highest where users can install untrusted or unmanaged applications. Managed fleets with current OS updates and restricted app installation have lower exposure.
Exploitation context
The source bundle does not establish active exploitation. CISA KEV status is false. The vulnerability requires a malicious application with local execution, which may cause unexpected system termination or kernel memory writes. A Google Threat Intelligence link is referenced, but details are not provided in the bundle.
Researcher notes
Evidence supports a local malicious-app scenario, not remote exploitation. Apple’s description is brief and does not name the vulnerable component. Treat exploit-chain claims cautiously unless confirmed from the referenced Google advisory or Apple language outside this bundle.
Mitigation direction
- Update affected Apple devices to the fixed OS versions listed by Apple.
- Prioritize devices used by executives, administrators, and high-risk users.
- Use MDM reporting to enforce minimum OS versions across managed fleets.
- Restrict installation of untrusted applications where operationally feasible.
- Monitor Apple advisories for any revised guidance or superseding updates.
Validation and detection
- Inventory iOS, iPadOS, macOS, tvOS, visionOS, and watchOS versions.
- Compare device versions against Apple’s fixed release list.
- Confirm MDM compliance policies require the fixed releases or later.
- Review exceptions for unmanaged or user-owned Apple devices.
- Check CISA KEV and Apple pages for status changes.
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-120: 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 lookupCVE-2025-43520 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/125632CVE reference
- https://support.apple.com/en-us/125633CVE reference
- https://support.apple.com/en-us/125634CVE reference
- https://support.apple.com/en-us/125635CVE reference
- https://support.apple.com/en-us/125636CVE reference
- https://support.apple.com/en-us/125637CVE reference
- https://support.apple.com/en-us/125638CVE reference
- https://support.apple.com/en-us/125639CVE reference
- https://cloud.google.com/blog/topics/threat-intelligence/darksword-ios-exploit-chain/CVE reference · third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43520CVE 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.