Loading vulnerability…
CVE-2020-9922 is a logic issue in Apple macOS Mail, where processing a maliciously crafted email could allow an attacker to write arbitrary files to the filesystem. The vulnerability is due to improper state management when handling email content, which could be exploited to bypass normal file write restrictions.
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.
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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (POC) patch for Apple Mail's CVE-2020-9922 zero-click vulnerability, which affects macOS versions prior to High Sierra. The exploit is not a traditional offensive exploit, but rather a defensive patch implemented as a Mail.app plugin (mailbundle). The main code (main.m) uses Objective-C runtime method swizzling (via ZKSwizzle) to override the isAutoArchivePart method of the MCMimePart class, always returning false. This prevents the vulnerable code path from being triggered, thereby mitigating the vulnerability. The repository includes the ZKSwizzle library for method swizzling, Xcode project files for building the plugin, and a README describing the vulnerability and usage. The plugin must be installed in the user's Mail Bundles directory. No network or remote endpoints are present; the attack vector is local, requiring installation on the target system.
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.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
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.