WebKit iframe sandbox enforcement bypass
CVE-2021-1765 is a WebKit vulnerability in Apple macOS whereby maliciously crafted web content can violate iframe sandboxing policy. Apple states the issue was addressed through improved iframe sandbox enforcement and fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, and Security Update 2021-001 Mojave. The available context indicates the flaw enabled web content rendered in a sandboxed iframe to bypass intended sandbox restrictions, and external reporting associates it with malvertising activity that abused the bypass in WebKit-based browsers.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced (not detailed) as a browser vulnerability previously exploited by a malvertising threat actor (“Yosec”) to deliver malware.
A WebKit sandbox bypass vulnerability affecting iframe sandboxing policy.
A WebKit browser vulnerability related to an iframe sandbox bypass exploit abused in malvertising campaigns, allowing bypass of iframe sandboxing protections.
The version that knows your environment.
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.