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CVE-2021-1879 is a universal cross-site scripting vulnerability in Apple WebKit affecting iOS, iPadOS, and watchOS. Processing maliciously crafted web content can enable attacker-controlled script to bypass web-origin isolation. Apple addressed the issue through improved management of object lifetimes. The vulnerability was exploited in targeted campaigns attributed to APT29, also known as Cozy Bear and NOBELIUM.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A WebKit vulnerability affecting Apple iOS, iPadOS, and watchOS that the content says APT29 exploited.
A zero-day vulnerability in Apple WebKit (CVE-2021-1879) that allowed attackers to bypass Safari protections and steal authentication cookies from major web services, enabling session hijacking.
A specific vulnerability (CVE-2021-1879) associated with exploitation or targeting by the Cozy Bear (APT29) threat actor.
A specific vulnerability (CVE-2021-1879) associated with exploitation or targeting by the Cozy Bear (APT29) threat actor.
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.