Security readout for executives and security teams
Plain-English summary
A malicious webpage could crash an affected Apple browser or related process, disrupting availability. The supplied evidence does not indicate data theft, unauthorized changes, or code execution. Apple addressed the issue in its 26.1 operating-system releases and Safari 26.1.
Executive priority
Schedule prompt remediation through normal patching, prioritizing heavily used browsing endpoints and exposed user populations. Emergency incident response is not supported by the supplied evidence unless unexplained crashes or other local indicators are observed.
Technical view
CVE-2025-43440 is a remotely reachable, user-interaction-dependent availability flaw triggered while processing malicious web content. CVSS 3.1 scores it 6.5 with high availability impact and no stated confidentiality or integrity impact. Apple describes improved checks but provides no root-cause detail.
Likely exposure
Devices running versions earlier than Safari 26.1 or the listed Apple 26.1 operating-system releases may be exposed when users process malicious web content. The bundle does not define exact affected version ranges, so inventory-based confirmation is necessary.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not identified as being in CISA's Known Exploited Vulnerabilities catalog. Exploitation requires user interaction with maliciously crafted web content and is documented as causing an unexpected process crash.
Researcher notes
Apple attributes the fix to improved checks but does not disclose the vulnerable component or root cause in the bundle. The supplied CWE-79 classification does not clearly align with the documented availability-only crash impact. Exact vulnerable version ranges and reproducibility details are absent.
Mitigation direction
- Update Safari to version 26.1 or later where applicable.
- Update supported Apple operating systems to version 26.1 or later.
- Prioritize devices that routinely browse untrusted or externally supplied web content.
- Consult the applicable Apple advisory if a device cannot receive the listed release.
Validation and detection
- Inventory Safari and Apple operating-system versions across managed devices.
- Confirm applicable devices report version 26.1 or later after updating.
- Review endpoint telemetry for repeated browser or web-content process crashes.
- Verify update policies cover iOS, iPadOS, macOS, tvOS, visionOS, and watchOS assets.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2025-43440 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.
SSVC decision data
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:U/C:N/I:N/A:H2.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/125632CVE reference, apple
- https://support.apple.com/en-us/125634CVE reference, apple
- https://support.apple.com/en-us/125637CVE reference, apple
- https://support.apple.com/en-us/125638CVE reference, apple
- https://support.apple.com/en-us/125639CVE reference, apple
- https://support.apple.com/en-us/125640CVE reference, apple
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.