CVE-2020-27930
HighExploitedPublic exploitA memory corruption issue was addressed with improved input validation.
Published Mar 29, 2021 · Updated Oct 21, 2025 · Also known as TR-21-0263
Key Facts
Patch immediately- CVE-2020-27930 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Ipados (Apple), Iphone OS (Apple), macOS (Apple) and 3 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 26, 2020. Public exploit code is available.
- EPSS estimates a 22% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 14.2, Iphone OS 12.4.9, Mac OS X 10.15.7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
22%
Higher than 97.6% 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-2020-27930 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. Processing a maliciously crafted font may lead to arbitrary code execution.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| Industry KEV feed | Oct 26, 2020 | May 3, 2022 | Not reported |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
8 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 14.2 |
| Iphone OSApple | See advisory | 12.4.9 |
| macOSApple | >= unspecified | 11.0.1 |
| Mac OS XApple | See advisory | 10.15.7 |
| watchOSApple | >= unspecified | 5.3.9 |
Patched Releases
Ipados
14.2
Iphone OS
12.4.9
Mac OS X
10.15.7
macOS
11.0.1, 10.15, 11.0, 12.4, 2020, 5.3, 6.2
watchOS
5.3.9, 7.1
iOS and iPadOS
14.2
Timeline
Added to Industry KEV feed
Oct 26, 2020
Publicly disclosed
Mar 29, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Oct 21, 2025
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/xR_aHfkOkh4/apple-issues-urgent-patch-update-for.html
- advisoryhttp://packetstormsecurity.com/files/161294/Apple-Safari-Remote-Code-Execution.html
- advisory20201215 APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1
- advisoryhttps://isc.sans.edu/
- advisoryhttps://isc.sans.edu/diary/rss/27250
FAQ
Common Questions.
A memory corruption issue was addressed with improved input validation.
Affected: Ipados (Apple); Iphone OS (Apple); macOS (Apple) versions >= unspecified, among others. 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 Oct 26, 2020.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including Ipados 14.2, Iphone OS 12.4.9, Mac OS X 10.15.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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