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Apple released iOS 13.3.1, iPadOS 13.3.1 and macOS Catalina 10.15.3 on January 28, 2020, along with security updates for macOS Mojave and High Sierra. SecurityWeek counted 23 vulnerabilities in the combined iOS and iPadOS release and 32 across the three macOS release lines—not 32 in Catalina alone. These are historical updates, not current patch instructions.
Which Apple updates were released?
Apple’s release date for this security update wave was January 28, 2020. It covered iPhones and iPads, Catalina Macs, and older Macs still running Mojave or High Sierra.
| Platform | January 2020 release | Scope identified in Apple’s advisory | Reported vulnerability count |
|---|---|---|---|
| iPhone and iPad | iOS 13.3.1 and iPadOS 13.3.1 | iPhone 6s and later; iPad Air 2 and later; iPad mini 4 and later; iPod touch (7th generation) | 23 combined, according to SecurityWeek |
| Mac | macOS Catalina 10.15.3 | Upgrading from macOS Catalina 10.15.2 | 32 across the Catalina, Mojave and High Sierra release group, according to SecurityWeek; not Catalina alone |
| Mac | Security Update 2020-001 for Mojave | macOS Mojave 10.14.6 | |
| Mac | Security Update 2020-001 for High Sierra | macOS High Sierra 10.13.6 |
The reported counts are SecurityWeek’s tally of the issues covered by these releases. Apple’s advisories list fixes and affected software by issue; they do not present a single aggregate severity score.
What kinds of vulnerabilities did the updates address?
The advisories describe different potential consequences depending on the issue and circumstances. They do not establish that every vulnerability was exploited in attacks against users.
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iOS and iPadOS examples
- A maliciously crafted image could lead to arbitrary code execution.
- A malicious application could, in some cases, execute code with system or kernel privileges.
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Apple’s iOS 13.3.1 and iPadOS 13.3.1 security content provides the issue-by-issue details and credits researchers and organizations including Google Project Zero and Trend Micro’s Zero Day Initiative.
macOS examples
- Searching for and opening a file from an attacker-controlled NFS mount could bypass Gatekeeper. Apple said the fix added Gatekeeper checks for files mounted through a network share.
- A separate issue involved a possible sandbox escape.
- A sudo buffer-overflow issue applied under certain configurations.
These are examples of documented potential impacts, not reports of confirmed attacks. Apple’s macOS Catalina 10.15.3 security content describes the fixes and credits.
Rank #2
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What did Apple and CISA advise?
Apple’s advisory preambles state: “For our customers’ protection, Apple doesn’t disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available.” The advisories identify the products and versions addressed, while listing individual security issues.
In an alert dated January 29, 2020, CISA encouraged users and administrators to review Apple’s security pages for the listed products and apply the necessary updates. That guidance concerned the 2020 releases: it should not be read as confirmation that these old versions are appropriate or sufficient for a device today.
Rank #3
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How should owners of older devices interpret this today?
These version numbers identify a historical patch wave, not the latest releases. The cited advisories establish which products were covered in January 2020, but do not establish the current security-support status of each legacy device. Check Apple’s current security releases and support information for the specific device and operating system before deciding what to install; do not assume that installing iOS 13.3.1 or macOS 10.15.3 makes a device current.
Apple’s advisories may display publication dates in 2023 and include later revisions, even though the updates they describe were released in January 2020. For the original release timing, CISA’s January 29, 2020 alert identifies the iOS, iPadOS and macOS products and recommends applying the necessary updates.
Quick Recap
Best Value
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Rank #4
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