KEV · Actively exploited

CVE-2020-6820

CVE-2020-6820 is actively exploited (CISA KEV catalog) : high severity (CVSS 8.1), 2 tracked apps concerned, none still exposed on their current version.

Severity (CVSS): 8.1
Exploitation: Confirmed
Tracked apps: 2
Still exposed: 0

Published on 2020-04-24

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

Attack vector : Network No privileges required No user interaction

Show raw CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS 7.06% predictive model; CISA confirms active exploitation percentile 94.0%

CISA Known Exploited Vulnerability

Added to KEV: 2021-11-03
Remediation deadline: 2022-05-03
Required action: Apply updates per vendor instructions.
Ransomware: Unknown (not documented by CISA)

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Firefox Windows winget:Mozilla.Firefox

Affected <68.6.1 Fixed in 68.6.1 Latest tracked 156.0.1 patched
Mozilla Thunderbird Windows winget:Mozilla.Thunderbird

Affected <68.7.0 Fixed in 68.7.0 Latest tracked 156.0.1 patched

Vulnerable CPE configurations (3)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	firefox All platforms (wildcard)	All platforms (wildcard)	<68.6.1	cpe:2.3:a:mozilla:firefox:::::esr:::*
mozilla	firefox All platforms (wildcard)	All platforms (wildcard)	<74.0.1	cpe:2.3:a:mozilla:firefox:::::-:::*
mozilla	thunderbird All platforms (wildcard)	All platforms (wildcard)	<68.7.0	cpe:2.3:a:mozilla:thunderbird::::::::

View on NVD ↗ CISA KEV catalog ↗ Advisory · www.mozilla.org

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