MEDIUM · CVSS 5.5
ACTIVELY EXPLOITED
PATCH AVAILABLE
CVE-2024-27834: Apple Multiple Products Improper Authentication Vulnerability
| Vendor | Apple |
|---|---|
| Product | Multiple Products |
| CVSS score | 5.5 · CVSS 3.1 · MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| EPSS | 1.5% (percentile 75) |
| Actively exploited | Yes |
| Added to CISA KEV | 4 Nov 2026 |
| CISA federal deadline | 18 Nov 2026 |
| Weakness (CWE) | CWE-287 |
| NVD published | 14 May 2024 |
| NVD last modified | 5 Nov 2026 |
| NVD status | Analyzed |
Affected versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Apple Safari | before 17.5 | 17.5 |
| Webkitgtk Webkitgtk | before 2.44.2 | 2.44.2 |
| Wpewebkit Wpe Webkit | before 2.44.2 | 2.44.2 |
| Apple Ipados | before 16.7.8 | 16.7.8 |
| Apple Ipados | from 17.0 before 17.5 | 17.5 |
| Apple Iphone Os | before 16.7.8 | 16.7.8 |
| Apple Iphone Os | from 17.0 before 17.5 | 17.5 |
| Apple Macos | before 14.5 | 14.5 |
| Apple Tvos | before 17.5 | 17.5 |
| Apple Watchos | before 10.5 | 10.5 |
| Fedoraproject Fedora | 39 | – |
| Fedoraproject Fedora | 40 | – |
Required action (CISA's text)
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Description (NVD)
The issue was addressed with improved checks. This issue is fixed in Safari 17.5, iOS 16.7.8 and iPadOS 16.7.8, iOS 17.5 and iPadOS 17.5, macOS Sonoma 14.5, tvOS 17.5, watchOS 10.5. An attacker with arbitrary read and write capability may be able to bypass Pointer Authentication.
SOURCES
- NVDNVD entry for CVE-2024-27834
- CISA KEVCISA Known Exploited Vulnerabilities catalog
- VENDORsupport.apple.com/en-us/120896
- VENDORsupport.apple.com/en-us/120898
- VENDORsupport.apple.com/en-us/120901
- VENDORsupport.apple.com/en-us/120902
- VENDORsupport.apple.com/en-us/120903
- VENDORsupport.apple.com/en-us/120905
- VENDORsupport.apple.com/en-us/HT214101
- VENDORsupport.apple.com/en-us/HT214102
- VENDORsupport.apple.com/en-us/HT214103
- VENDORsupport.apple.com/en-us/HT214104
- VENDORsupport.apple.com/en-us/HT214106
- VENDORsupport.apple.com/kb/HT214100
- VENDORsupport.apple.com/kb/HT214102
- VENDORsupport.apple.com/kb/HT214104
- VENDORsupport.apple.com/kb/HT214106
Other Apple flaws
- CVE-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability
- CVE-2026-65400: Apple macOS Improper Authentication Vulnerability
- CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability
- CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability
- CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 5 Nov 2026.