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Security Digest · Vulnerability record · Known exploited

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

Exploited in the wild (CISA KEV). The issue was addressed with improved checks.

CISA KEV · added 2026-11-04 CVSS 5.5 Medium EPSS 0.6% · p49 Check exposure

Updated By erroneo.us Security Desk29 references Seen in the digest for Nov 4, 2026

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

  • 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.

CISA’s summary

Apple iOS, iPadOS, macOS, Safari, tvOS and watchOS 10.5 contain an improper authentication vulnerability which could allow an attacker with arbitrary read and write capability to bypass pointer authentication.

Weakness type: CWE-287.

Product: Apple Multiple Products · Assigned by: apple · Published: 2024-05-13

Affected and fixed versions

VendorProductAffected versions (per CVE record)
AppleSafari< 17.5
AppleiOS and iPadOS< 16.7.8, < 17.5
ApplemacOS< 14.5
AppletvOS< 17.5
ApplewatchOS< 10.5

Severity scores

Scored byCVSSScoreVector
CISA-ADP3.15.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
  • Attack vector: local access needed
  • Attack complexity: low
  • Privileges required: low (any account)
  • User interaction: none
  • Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

  • 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.

Timeline

  • — CVE record published by apple
  • — Added to CISA’s Known Exploited Vulnerabilities catalog
  • — erroneo.us brief: APT29 Hijacks Plerdy Script to Hit Unpatched Phones
  • — CVE record last updated
  • — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

  1. Listed in CISA KEV notes (support.apple.com) support.apple.com
  2. Listed in CISA KEV notes (support.apple.com) support.apple.com
  3. Listed in CISA KEV notes (support.apple.com) support.apple.com
  4. Listed in CISA KEV notes (support.apple.com) support.apple.com
  5. Listed in CISA KEV notes (support.apple.com) support.apple.com
  6. Listed in CISA KEV notes (support.apple.com) support.apple.com

Vulnerability records

  1. CVE.org record CVE-2024-27834 cve.org
  2. NVD entry CVE-2024-27834 nvd.nist.gov

Government

  1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov
  2. Listed in CISA KEV notes (cisa.gov) cisa.gov
  3. Listed in CISA KEV notes (cisa.gov) cisa.gov

Other references from the CVE record and advisory

  1. sekoia.com sekoia.com
  2. support.apple.com support.apple.com
  3. support.apple.com support.apple.com
  4. support.apple.com support.apple.com
  5. support.apple.com support.apple.com
  6. support.apple.com support.apple.com
  7. seclists.org seclists.org
  8. openwall.com openwall.com
  9. seclists.org seclists.org
  10. seclists.org seclists.org
  11. seclists.org seclists.org
  12. seclists.org seclists.org
  13. lists.fedoraproject.org lists.fedoraproject.org
  14. lists.fedoraproject.org lists.fedoraproject.org
  15. support.apple.com support.apple.com
  16. support.apple.com support.apple.com
  17. support.apple.com support.apple.com
  18. support.apple.com support.apple.com

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