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CVE-2020-6819 is a use-after-free vulnerability caused by a race condition during execution of the nsDocShell destructor. The flaw affects Thunderbird before 68.7.0, Firefox before 74.0.1, and Firefox ESR before 68.6.1. Targeted attacks have abused the vulnerability in the wild.
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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.
If you can’t patch tonight, do this now.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A race-condition vulnerability that leads to use-after-free and is listed as exploited in the wild in CISA KEV.
A vulnerability where a race condition leads to a use-after-free; the content states it was exploited in the wild.
A vulnerability in which a race condition leads to use-after-free; the content states it was exploited in the wild.
A vulnerability where a race condition triggers a use-after-free; noted as exploited in the wild (per CISA KEV) in the provided content.
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.