CVE-2024-27823Public exploitNetwork attack vector

Network packet spoofing via IPv6 PRNG race

Published Jul 29, 2024 · Updated Apr 2, 2026

Kernel race condition in affected Apple operating systems allows attackers in a privileged network position to spoof IPv6 fragments. Concurrent XNU IPv6 Fragment ID generation updates shared pseudorandom-generator state without adequate locking, exposing state used to predict future IDs. Attackers able to observe the required packets can inject predicted fragments to partially alter UDP datagrams or TCP segments, including NFS writes and HTTP requests.

CVSS severity5.9
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel race condition in affected Apple operating systems allows attackers in a privileged network position to spoof IPv6 fragments. Concurrent XNU IPv6 Fragment ID generation updates shared pseudorandom-generator state without adequate locking, exposing state used to predict future IDs. Attackers able to observe the required packets can inject predicted fragments to partially alter UDP datagrams or TCP segments, including NFS writes and HTTP requests.

The record

CVE
CVE-2024-27823
Published
Jul 29, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-362, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <16.7.8
  2. Affected versionversion=0 <17.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <16.7.8; version=0 <17.5
Apple · visionOSversion=0 <1.3
Apple · tvOSversion=0 <17.5
Apple · macOSversion=0 <12.7.5; version=0 <13.6.7; version=0 <14.5
Apple · watchOSversion=0 <10.5

Published CVSS scores

5.9NISTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
5.9CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1565.002Transmitted Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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