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CVE-2021-1782 is a race condition in the Apple kernel affecting macOS, iOS, iPadOS, watchOS, and tvOS. Improper locking of a shared kernel resource permits a malicious application to win a timing window and elevate its privileges. Apple corrected the issue through improved locking. Apple reported awareness of information indicating that the vulnerability may have been exploited in the wild.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a proof-of-concept (PoC) exploit for CVE-2021-1782, a use-after-free vulnerability in the XNU kernel's voucher subsystem affecting iOS <= 14.3. The main exploit logic is implemented in 'voucher_leak.c', which coordinates a race condition using multiple threads to trigger the vulnerability in the user_data voucher attribute manager. Supporting files include 'iosurface.c' and 'iosurface.h' for kernel memory spraying via the IOSurfaceRootUserClient, and 'log.c'/'log.h' for logging. The 'entitlements.xml' file provides the necessary entitlements for the exploit binary to interact with the required IOKit interfaces. The exploit demonstrates kernel memory leakage on iOS 13 and can cause a kernel panic on iOS 14. The code is written in C and is intended to be compiled for arm64 iOS devices. This is a local exploit requiring code execution on the target device, and does not involve network endpoints.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An iOS in-the-wild vulnerability related to 'vouchers' (as stated in the title).
An Apple race-condition vulnerability that permits a malicious application to elevate privileges. Apple reported that it may have been actively exploited.
A kernel vulnerability that may allow arbitrary code execution with kernel privileges.
A previously patched zero-day impacting Apple kernels across multiple platforms, mentioned as background.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.