CVERadar
MEDIUM · CVSS 3.1 5.5CISA KEV · added 2026-11-04EPSS 1.41% (p73)Threat level 43

CVE-2024-27834: Apple Multiple Products Improper Authentication Vulnerability

Apple · Multiple Products · NVD published 2024-05-14 · posted 2026-11-04 · last modified 2026-11-05

CVE-2024-27834 at a glance

CVE-2024-27834 is a medium-severity Auth Bypass vulnerability in Apple Multiple Products, with a CVSS 3.1 base score of 5.5. NVD published it on 2024-05-14 and classifies the weakness as CWE-287. CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-04; the federal remediation due date is 2026-11-18. FIRST EPSS puts the probability of exploitation activity in the next 30 days at 1.41% (percentile 72.8, scored 2026-11-05). NVD configuration data lists a fixed release for 8 products, for example apple safari 17.5. CVERadar maps 2 MITRE ATT&CK techniques across Initial Access, Stealth, Persistence and Privilege Escalation, inferred from the CWE and the description. Its CVERadar threat level is 43/100.

What it is

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.

WeaknessCWE-287 definition
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N (source: NIST NVD)
CISA due date2026-11-18 (for US federal agencies under BOD; a good deadline for everyone)
ATT&CK tacticsInitial Access → Persistence → Privilege Escalation → Stealth

CVERadar report: CVE-2024-27834: Apple Multiple Products flaw exploited in the wild, what we know

What this means for a small business

CISA added CVE-2024-27834 to its Known Exploited Vulnerabilities catalog on 2026-11-04. A KEV listing means CISA has evidence that attackers are using the flaw against real systems, not just that it could be used.

If your business runs Apple Multiple Products, put this at the top of the patch list. CISA gave US federal agencies until 2026-11-18 to deal with it, and that is a sensible deadline for a small business too.

  • Patch. Update to a fixed release: apple safari 17.5 or later; apple ipados 17.5 or later; apple iphone os 17.5 or later. These versions come from NVD's configuration data, so confirm them against the advisory from Apple.
  • If you cannot patch yet. Follow CISA's required action: 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.
  • Check your exposure. Find out whether Apple Multiple Products can be reached from the internet, for example a VPN portal, an admin login page or a file-transfer site. Your firewall's port-forwarding rules and your IT provider's list of public-facing systems are the quickest places to look. Exposed copies come first.
  • When to call IT support. Call your IT support provider now if you run Apple Multiple Products and cannot confirm it is updated, if it was reachable from the internet before you patched it, or if you notice accounts, sign-ins or files you do not recognise. The last two can mean the system was already hit, and checking that properly takes someone who can read the logs.

Need to brief a manager? This LayerLogix explainer on CVE-2024-27834 covers what it means for a business and how to fix it. Businesses without a dedicated security person can have LayerLogix watch their computers for threats.

Built from the CISA KEV entry and the NVD record for CVE-2024-27834; nothing here goes beyond those sources.

Exploitation evidence

First exploit evidence seen: 2026-11-04 (earliest date across the sources below).

Exploited in the wild

Sources: CISA KEV.

Defend the Chain

The attack chain for CVE-2024-27834 laid across the MITRE ATT&CK Enterprise tactics. Solid cards come from the MITRE CTID KEV mappings; dashed cards are inferred by CVERadar from the CWE or description. Correct defences are real ATT&CK mitigations for that technique.

Threat level 43/100
Defender level 1 · 0 XP
Chain links broken: 0/2

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Stealth

Defense Impairment

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Pick a red technique card on the board, then choose the defence that stops it.

Defend against T1190 Exploit Public-Facing Application Inferred

Inferred from CWE CWE-287

Patches, mitigations and detection

CISA required action

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. (source: CISA KEV)

Fixed versions

  • apple safari: upgrade to 17.5 or later
  • apple ipados: upgrade to 17.5 or later
  • apple iphone os: upgrade to 17.5 or later
  • apple macos: upgrade to 14.5 or later (affected from 14.0)
  • apple tvos: upgrade to 17.5 or later
  • apple watchos: upgrade to 10.5 or later
  • webkitgtk webkitgtk: upgrade to 2.44.2 or later
  • wpewebkit wpe webkit: upgrade to 2.44.2 or later

Derived from the NVD CPE configuration (versionEndExcluding / versionEndIncluding). Always confirm with the vendor advisory.

Vendor advisories and patches

MITRE ATT&CK mitigations for this chain

  • M1048 Application Isolation and Sandboxing (for T1190) : Application isolation will limit what other processes and system features the exploited target can access.
  • M1037 Filter Network Traffic (for T1190) : Restrict outbound network traffic from public-facing servers to prevent unauthorized connections from initiating communications with attacker-controlled infrastructure. While this may not prevent the initial exploitation, it limits the attacker's ability to verify and control the compromised server post-exploit, reduci
  • M1030 Network Segmentation (for T1190) : Segment externally facing servers and services from the rest of the network with a DMZ or on separate hosting infrastructure.
  • M1016 Vulnerability Scanning (for T1190) : Regularly scan externally facing systems for vulnerabilities and establish procedures to rapidly patch systems when critical vulnerabilities are discovered through scanning and through public disclosure.
  • M1026 Privileged Account Management (for T1190, T1078) : Use least privilege for service accounts will limit what permissions the exploited process gets on the rest of the system.
  • M1050 Exploit Protection (for T1190) : Web Application Firewalls may be used to limit exposure of applications to prevent exploit traffic from reaching the application.
  • M1035 Limit Access to Resource Over Network (for T1190) : Ensure that all publicly exposed services are actually intended to be so, and restrict access to any that should only be available internally.
  • M1051 Update Software (for T1190) : Update software regularly by employing patch management for externally exposed applications.
  • M1027 Password Policies (for T1078) : Applications and appliances that utilize default username and password should be changed immediately after the installation, and before deployment to a production environment. When possible, applications that use SSH keys should be updated periodically and properly secured. Policies should minimize (if not eliminate)
  • M1018 User Account Management (for T1078) : Regularly audit user accounts for activity and deactivate or remove any that are no longer needed.

Detection Generic guidance

  • Initial Access: Alert on unusual requests to the affected service (odd paths, oversized payloads, exploit strings) in WAF, reverse-proxy and application logs.
  • Persistence: Look for new files in web roots, new scheduled tasks/services, and new accounts created after the exposure window.
  • Privilege Escalation: Alert on processes gaining SYSTEM/root unexpectedly, and on exploitation crashes of privileged services.

Response checklist Generic guidance

  1. Inventory: find every instance of the affected product and version (include internet-facing and forgotten ones).
  2. Patch or mitigate per the vendor advisory; if you cannot patch, remove internet exposure or apply the vendor workaround.
  3. Assume compromise if the system was exposed before patching: hunt for the indicators in the advisory and review logs back to the disclosure date.
  4. Rotate credentials and secrets stored on or used by the affected system if compromise cannot be ruled out.

Sources