VulnerabilityPublished 12 Dec 2025Updated 2 Apr 2026

CVE-2025-43506: Apple macOS · Type Confusion

Affects Apple macOSSource CVE Database V5

Not known to be exploited · CVSS 7.5 High · fixed in 26.1 : patch Apple macOS soon.

Data as of 26 Oct 2026, 12:55 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 26.1

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 12 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Apple macOS	Affected =0	Fixed in–

AI-suggested

To mitigate CVE-2025-43506, organizations and users should promptly update all affected macOS systems to version Tahoe 26.1 or later, where the issue is fixed. For environments where immediate patching is not feasible, consider limiting concurrent multi-user logins on macOS devices to prevent the condition that triggers the vulnerability. Network monitoring should be enhanced to detect unusual traffic patterns that might indicate Private Relay failures or attempts to exploit this flaw. Additionally, educate users about the importance of logging out of shared devices when not in use to reduce exposure. IT administrators should review device usage policies to minimize shared access and consider deploying endpoint protection solutions capable of detecting anomalous network activity. Finally, maintain awareness of Apple security advisories for any updates or additional mitigations related to this vulnerability.

Description

A logic error was addressed with improved error handling. This issue is fixed in macOS Tahoe 26.1.iCloud Private Relay may not activate when more than one user is logged in at the same time.

Impact

The primary impact of CVE-2025-43506 is the potential exposure of user internet traffic that would normally be protected by iCloud Private Relay, leading to a loss of confidentiality. This can allow network attackers or observers to monitor browsing activity, IP addresses, and potentially infer user behavior or location. For organizations, this undermines privacy guarantees and may violate compliance requirements related to data protection. The vulnerability does not affect data integrity or system availability, but the privacy implications are significant, especially for sensitive or regulated environments. Multi-user macOS systems, such as shared workstations, labs, or kiosks, are at higher risk because the flaw manifests specifically when multiple users are logged in simultaneously. The ease of exploitation without authentication or user interaction increases the threat level, as attackers can potentially trigger the failure remotely. Although no known exploits exist currently, the vulnerability's characteristics make it a likely target for future attacks aiming to bypass privacy protections.

References

support.apple.com/en-us/125634 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Apr 2026, 02:33 UTC

WeaknessesCWE-843

Technical details

References

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