CVE-2021-30657
MediumExploitedPublic exploitA logic issue was addressed with improved state management.
Published Dec 24, 2021 · Updated Oct 21, 2025 · Also known as TR-21-1024
Key Facts
Patch immediately- CVE-2021-30657 is a medium-severity vulnerability (CVSS 5.5 v3.1) affecting macOS (Apple), Mac OS X (Apple).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 26, 2021. Public exploit code is available.
- EPSS estimates a 69% probability of exploitation in the next 30 days.
- Fixed versions are available, including Mac OS X <=10.15.5, macOS 11.3, macOS 2021.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS (30-day exploit likelihood)
69%
Higher than 99.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-30657 brief as a PDF
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Description
A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Apr 26, 2021 | Nov 17, 2021 | Not reported |
| CIRCL KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
11 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| macOSApple | >= unspecified | 11.3 |
| Mac OS XApple | 10.15.6, 10.15.6-supplemental_update, 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-supplemental_update | 10.15.5 |
Patched Releases
Mac OS X
<=10.15.5
macOS
11.3, 2021
Timeline
Added to Industry KEV feed
Apr 26, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Publicly disclosed
Dec 24, 2021
Last updated
Oct 21, 2025
Weakness Type
- CWE-862 Missing Authorization
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
- advisoryhttps://saaramar.github.io/IOMFB_integer_overflow_poc/
- advisoryhttps://securityaffairs.co/wordpress/123236/mobile-2/apple-zero-day-vulnerability.html?utm_source=rss&utm_medium=rss&utm_campaign=apple-zero-day-vulnerability
- advisoryhttps://support.apple.com/en-us/HT212325
- advisoryhttps://support.apple.com/en-us/HT212326
FAQ
Common Questions.
A logic issue was addressed with improved state management.
Affected: macOS (Apple) versions >= unspecified; Mac OS X (Apple) versions 10.15.6, 10.15.6-supplemental_update, 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-supplemental_update. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 26, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Mac OS X <=10.15.5, macOS 11.3, macOS 2021.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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