iOS Bug Causes Specific Network Name to Disable Wi-Fi on iPhones
A wireless network naming bug has been discovered in iOS that effectively disables an iPhone's ability to connect to Wi-Fi.

Security researcher Carl Schou found that after joining a Wi-Fi network with the name "%p%s%s%s%s%n" his iPhone's Wi-Fi functionality was left "permanently disabled."
Changing a hotspot's SSID did nothing to correct the problem, with even a reboot failing to make a difference, according to BleepingComputer.
Other users who were able to replicate the issue have suggested the bug could be related to the initial use in the network name of the percentage sign, which leads to an input parsing issue whereby iOS mistakenly interprets the letters following the "%" as a string-format specifier.
In C and C-style languages, string format specifiers have a special meaning and are parsed by the language compiler as a variable name or a command instead of standard text.
Android phones don't seem to be affected by the same network, but iPhones hit by the problem need to have their network settings reset before a Wi-Fi hotspot can be connected again.
To perform the reset, open the Settings app, tap General -> Reset, then tap Reset Network Settings and confirm the request at the prompt.
Related Stories
Apple's iPhone 14 and rumored mixed reality headset will feature Wi-Fi 6E connectivity, according to reliable analyst Ming-Chi Kuo.
In an investor note obtained by MacRumors, TF Securities analyst Ming-Chi Kuo said that new Apple products, including the iPhone 14 and a head-mounted display device, will accelerate a broader industry upgrade to the Wi-Fi 6E specification. Motivated by the...
Today we're tracking a collection of iPad Pro discounts from Amazon and B&H Photo, offering up to $100 off 11-inch and 12.9-inch models. One of the most notable discounts is on the 128GB Wi-Fi 12.9-inch iPad Pro, available for $999.00, down from $1,099.00.
Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small...
Apple and its supplier Broadcom today convinced a U.S. appeals court to reject a jury verdict that required them to pay $1.1 billion for infringing on Wi-Fi patents that belong to the California Institute of Technology (via Reuters).
In 2016, Caltech accused Apple and Broadcom of infringing on its patents related to the Wi-Fi technology used in many Apple devices. Caltech's patents, granted...
The iPhone 14 could offer better battery life and feature Wi-Fi 6E connectivity thanks to a new 5G chip, supply chain sources claim.
Taiwan's Economic Daily News reports that TSMC has obtained all of Apple's orders for its 5G radio frequency (RF) chips for the iPhone 14 lineup, taking over from Samsung. The chips, likely related to Apple's selection of Qualcomm's Snapdragon X65 modem, are...
Apple today published a new support document indicating that iOS 15.4 and watchOS 8.5 allow an Apple Watch to be restored with a nearby iPhone.
The support document states that if an Apple Watch running watchOS 8.5 or later displays an animation showing an Apple Watch and iPhone being brought close together, customers can follow the steps below to initiate the restore process:1. Make sure...
Apple today released tvOS 15.4, the fourth major update to the tvOS operating system that first launched in September 2021. tvOS 15.4 comes less than two months after the launch of tvOS 15.3.
tvOS 15.4 can be downloaded over the air on the Apple TV through the Settings app by going to System > Software Update. Apple TV owners who have automatic software updates...
The latest beta for iOS and iPadOS 14.7, released to developers this week, patches a bug that disabled an iPhone's ability to connect to Wi-Fi if a user connected to a specific Wi-Fi network with the name "%p%s%s%s%s%n."
In his latest video rounding up the latest changes in the beta, YouTuber Zollotech found that the update has silently patched the bug that caused an iPhone to become unable...
Lighting company Sengled today announced the launch of several new smart lighting products, including Wi-Fi Video-Sync TV Light Strips, Wi-Fi Outdoor String Lights, and the Wi-Fi Portable Lamp.
The WiFi TV Light Strips are designed to extend what's showing on the television set to the wall behind it for a more immersive entertainment experience. The lights are designed to react to content...
Popular Stories
Earlier this week, The Information's Wayne Ma outlined struggles that Apple has faced during the development of its long-rumored AR/VR headset. Now, in a follow-up report, he has shared several additional details about the wearable device. Apple headset render created by Ian Zelbo based on The Information reporting For starters, one of the headset's marquee features is said to be lifelike...
While Apple's early M1-based Macs can only officially support a single external display, there are ways around the limitation. Anker is launching a new 10-in-1 USB-C docking station today which delivers just that.
The Anker 563 USB-C dock includes two HDMI ports and a DisplayPort port, and it leverages DisplayLink to carry multiple video signals over a single connection. Given that this hub...
Apple today shared a new ad highlighting iPhone privacy features like App Tracking Transparency and Mail Privacy Protection that are designed to give users more transparency and control when it comes to their personal data being collected.
The ad revolves around a young woman named Ellie who discovers that her personal data is being sold at an auction house, with bids being placed on her...
The Apple Watch Series 8 could feature an all-new design with a flat display, according to the leaker known as "ShrimpApplePro."
In his latest video on the YouTube channel Front Page Tech, Jon Prosser highlighted information from ShrimpApplePro that suggests the Apple Watch Series 8 could feature a flat display in what seems to be a design originally rumored for the Apple Watch Series 7. ...
Sony this week came out with an updated version of its popular over-ear noise canceling headphones, so we picked up a pair to compare them to the AirPods Max to see which headphones are better and whether it's worth buying the $400 WH-1000XM5 from Sony over Apple's $549 AirPods Max.
Subscribe to the MacRumors YouTube channel for more videos. First of all, the AirPods Max win out when it comes ...
With around four months to go before Apple is expected to unveil the iPhone 14 lineup, the overwhelming majority of rumors related to the new devices so far have focused on the iPhone 14 Pro, rather than the standard iPhone 14 – leading to questions about how different the iPhone 14 will actually be from its predecessor, the iPhone 13.
The iPhone 14 Pro and iPhone 14 Pro Max are expected...
Apple last week demonstrated its upcoming AR/VR headset to Apple board members, indicating that the device is in an advanced stage of development and could see a debut in the not too distant future, reports Bloomberg. Apple has also ramped up development of the software that runs on the headset, with that software expected to be called "RealityOS," or rOS for short. Render via designer Ian ...
Top Rated Comments
That's why Apple should promptly fix the root issue before worse exploits have a chance to happen.