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Known exploited vulnerability

CVE-2024-27834

mediumCVSS 3.1 5.5In CISA KEVEPSS 1.5%Published · Apple

The short answer

CVE-2024-27834 affects Apple Safari and is rated medium (CVSS 5.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-04: attackers are using it, so patch it first.

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.

Weakness: CWE-287.

Severity

5.5 medium

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploited (CISA KEV)

Yes, since Nov 4, 2026

Federal due date Nov 18, 2026

EPSS, next 30 days

1.5%

Higher than 75% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

What CISA says to do

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…

Affected products

Safari, iOS and iPadOS, macOS, tvOS, watchOS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2024-27834 being exploited?

Yes. CISA added CVE-2024-27834 to its Known Exploited Vulnerabilities catalog on 2026-11-04, with a federal remediation due date of 2026-11-18.

How do I fix 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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