CVE-2024-40803VulnerabilityPublished 29 Jul 2024Updated 2 Apr 2026

CVE-2024-40803: Apple macOS · An attacker may be able to cause unexpected app termination

Affects Apple macOSSource CVE Database V5

Not known to be exploited · CVSS 7.5 High · fixed in 12.7.6 : patch Apple macOS soon.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 1.2% chance of exploitation in 30 days – higher than 68% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 12.7.6

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

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

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: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Jul 2024
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 2026-10-26.

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 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-2024-40803, organizations should immediately apply the security updates released by Apple for macOS Monterey 12.7.6, Sonoma 14.6, and Ventura 13.6.8 or later versions. Beyond patching, administrators should monitor application logs and system stability for signs of unexpected crashes that could indicate exploitation attempts. Network segmentation and limiting exposure of macOS systems to untrusted networks can reduce the attack surface. Employing endpoint detection and response (EDR) solutions capable of detecting abnormal process terminations may help identify exploitation attempts early. Organizations should also enforce strict software update policies to ensure timely deployment of security patches. For critical environments, consider implementing application whitelisting and restricting execution of untrusted code. Regular backups and business continuity planning will help mitigate operational impact in case of service disruption. Finally, educating users and IT staff about this vulnerability and its symptoms can improve incident response readiness.

Description

A type confusion issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.7.6, macOS Sonoma 14.6, macOS Ventura 13.6.8. An attacker may be able to cause unexpected app termination.

Impact

The primary impact of CVE-2024-40803 is denial of service through unexpected application termination on affected macOS systems. This can disrupt business operations, especially for organizations relying on macOS for critical applications or services. Although the vulnerability does not compromise data confidentiality or integrity, repeated or targeted exploitation could degrade system availability and user productivity. Network-exposed services or applications running on vulnerable macOS versions are at risk of remote crashing without requiring any privileges or user interaction, increasing the threat surface. This could be leveraged by attackers to cause operational disruptions or as part of a larger attack chain. Enterprises with mixed environments that include macOS endpoints may face challenges maintaining service continuity if this vulnerability is exploited. The lack of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks. Overall, the impact is significant for availability but limited in scope to macOS platforms.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 2 Apr 2026, 23:28 UTC

WeaknessesCWE-843

Technical details

References

Community reviews

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