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CVE-2020-6820 is a use-after-free vulnerability in Mozilla Firefox, Firefox ESR, and Thunderbird that can be triggered under certain conditions while handling a ReadableStream. Available reporting further identifies the flaw as residing in Firefox’s Cache subsystem, specifically involving CacheStreamControlParent when closing its last open read stream. The issue is caused by a race condition that can lead to premature object destruction followed by subsequent access to freed memory. Mozilla issued an out-of-band security update for this vulnerability in April 2020, and the flaw was reported as having been exploited in targeted attacks in the wild. Affected versions include Thunderbird before 68.7.0, Firefox before 74.0.1, and Firefox ESR before 68.6.1.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Firefox use-after-free in the Cache subsystem involving CacheStreamControlParent when closing the last open read stream; included as an in-the-wild 2020 0-day and a variant of an earlier Mozilla bug.
Firefox竞争条件导致的UAF漏洞之一，文中称已被在野利用。
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.