Apple Releases iOS 27.2.1 and macOS 27.2.1 Security Updates

Apple has released iOS 27.2.1, iPadOS 27.2.1, and macOS 27.2.1 updates. The updates include bug fixes and security updates.

Security fixes

According to MacRumors, the updates fix a handful of security vulnerabilities. A bug with iMessage could let a remote attacker join a group chat to receive its messages, and another could let users see messages sent before they joined a group chat.

Most of the vulnerabilities involved AirPlay and Bluetooth. A malicious Bluetooth device could pair without user interaction, and another bug could let a nearby attacker corrupt process memory. Several bugs could allow an attacker to bypass the rate limit on AirPlay pairing code attempts.

Apple credits itself on four of the vulnerabilities, so they were found internally.

With the macOS update, Apple also addressed the eMudhra certificate vulnerability, adding protections for command-line tools.

Apple did not say that the flaws have been exploited in the wild, but with the details on each vulnerability now public, devices that are not running the new software could be more vulnerable to attack.

Build numbers and other updates

AppleInsider lists the following build numbers:

• iOS 27.2.1 (Build number 24B8156)
• iOS 27.2.1 (24B91034) for iPhone Duo
• iPadOS 27.2.1 (24B8156)
• macOS 27.2.1 (26B131)
• macOS 27.2.1 (26B7131) for M6 MacBook Pro and iMac
• macOS 27.2.1 (26B8132) for PROLED MacBook Pro
• visionOS 27.2.1 (24N124)
• watchOS 27.2.1 (24S132)

Apple also issued updates for earlier operating system generations:

• iOS 26.7.3 (23H131)
• iOS 18.7.12 (22H390)
• iPadOS 26.7.3 (23H131)
• iPadOS 18.7.12 (22H390)
• macOS 26.7.3 (25G342)
• macOS 15.8.3 (24H241)
• watchOS 26.6.1 (23U95)

Installation

To manually install iOS 27.2.1 on an iPhone, open the Settings app, tap General, then Software Update. Tap the iOS 27.2.1 update and follow the instructions. If you have automatic updates enabled, this will be performed on your behalf.

Why it matters

The updates address security vulnerabilities in iMessage, AirPlay, Bluetooth, and certificates. Apple did not say that the flaws have been exploited in the wild, but devices that are not running the new software could be more vulnerable to attack now that vulnerability details are public.

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Sources

• macrumors.com: Here's What Apple Fixed in iOS 27.2.1 and macOS 27.2.1 - MacRumors
• macworld.com: Apple releases security updates: iOS 27.2.1, 26.7.3, and 18.7.12 | Macworld
• appleinsider.com: Incremental iOS 27.2.1, iPadOS updates arrive with bug fixes
• mezha.net: Apple rolls out iOS 27.2.1 to fix bugs and add security updates

This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.