---
title: "CVE-2024-27834: Apple Multiple Products Improper Authentication Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-27834/
description: "CVE-2024-27834 (Apple Multiple Products): Exploited in the wild (CISA KEV). The issue was addressed with improved checks. This issue is fixed in Safari…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-05-13
date_modified: 2026-11-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-27834"
kev: true
cvss: 5.5
epss: 0.00598
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Apple Multiple Products. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-11-04, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-11-18 ; treat that as the outer limit, not the target.
- EPSS 0.6% , percentile 49: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 49% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.
- Editorial verdict: Check exposure. APT29 Hijacks Plerdy Script to Hit Unpatched Phones — Every chain in this campaign uses already-patched bugs and Sekoia says fully updated devices are safe, so the real work is finding the stale iPhones and Android phones in your fleet and checking whether your sites loaded Plerdy in late August.

## 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.

## Affected products (CVE record)

- Apple Safari: < 17.5
- Apple iOS and iPadOS: < 16.7.8, < 17.5
- Apple macOS: < 14.5
- Apple tvOS: < 17.5
- Apple watchOS: < 10.5

## Severity

- CISA-ADP CVSS 3.1: 5.5 `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`

## Exploitation

- CISA KEV: added 2026-11-04; federal due date 2026-11-18. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-11-04): 0.60% probability of exploitation activity in the next 30 days; percentile 49.

## Sources

- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/120896)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/120898)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/120901)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/120902)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/120903)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/120905)
- [CVE.org record CVE-2024-27834](https://www.cve.org/CVERecord?id=CVE-2024-27834)
- [NVD entry CVE-2024-27834](https://nvd.nist.gov/vuln/detail/CVE-2024-27834)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27834)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [sekoia.com](https://www.sekoia.com/blog/poisoned-source-apt29-watering-holes-targets-mobile-devices-with-n-day-exploits)
- [support.apple.com](https://support.apple.com/en-us/HT214101)
- [support.apple.com](https://support.apple.com/en-us/HT214106)
- [support.apple.com](https://support.apple.com/en-us/HT214104)
- [support.apple.com](https://support.apple.com/en-us/HT214103)
- [support.apple.com](https://support.apple.com/en-us/HT214102)
- [seclists.org](http://seclists.org/fulldisclosure/2024/May/17)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/05/21/1)
- [seclists.org](http://seclists.org/fulldisclosure/2024/May/10)
- [seclists.org](http://seclists.org/fulldisclosure/2024/May/9)
- [seclists.org](http://seclists.org/fulldisclosure/2024/May/12)
- [seclists.org](http://seclists.org/fulldisclosure/2024/May/16)
- [lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WKIXADCW3O4R2OOSDZGPU55XQFE6NA3M/)
- [lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ADCLQW54XN37VJZNYD3UKCYATJFIMYXG/)
- [support.apple.com](https://support.apple.com/kb/HT214106)
- [support.apple.com](https://support.apple.com/kb/HT214104)
- [support.apple.com](https://support.apple.com/kb/HT214102)
- [support.apple.com](https://support.apple.com/kb/HT214100)

---
Source page: https://erroneo.us/security/cve/CVE-2024-27834/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt