CVE-2024-27834: in the CISA KEV catalogue

Apple Multiple Products Improper Authentication Vulnerability. CISA added CVE-2024-27834 to the Known Exploited Vulnerabilities catalogue on 2026-11-04 with a default due date of 2026-11-18. Known ransomware campaign use: Unknown. Forensic triage flag: No.

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. (CISA description)

Vendor / product: Apple Multiple Products
CWE: CWE-287
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.
EPSS: 0.60%, percentile 48 (scored 2026-11-04)

EPSS puts about 6.0 in 1,000 odds (0.60%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 48% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.04, released 2026-11-04, 1,768 entries (checked 2026-11-05). EPSS model v2026.06.15, scored 2026-11-04, 400,189 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2024-27834 in the CISA KEV catalogue?

Yes. CISA added CVE-2024-27834 (Apple Multiple Products Improper Authentication Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2026-11-04. CISA's default due date for it is 2026-11-18.

Is CVE-2024-27834 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2024-27834. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2024-27834?

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.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2024-27834