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CVE-2020-6820

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...

Basic Information

CVE State
PUBLISHED
Reserved Date
January 10, 2020
Published Date
April 24, 2020
Last Updated
February 07, 2025
Vendor
Mozilla
Product
Thunderbird, Firefox, Firefox ESR
Description
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.
Tags
cisa

CVSS Scores

CVSS v3.1

8.1 - HIGH

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

CVSS v2.0

6.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

SSVC Information

Exploitation
active
Technical Impact
total

Exploit Status

Exploited in the Wild
Yes (2021-11-03 00:00:00 UTC) Source

References

https://www.mozilla.org/security/advisories/mfsa2020-14/ https://www.mozilla.org/security/advisories/mfsa2020-11/ https://bugzilla.mozilla.org/show_bug.cgi?id=1626728 https://usn.ubuntu.com/4335-1/

Known Exploited Vulnerability Information

Source Added Date
CISA 2021-11-03 00:00:00 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel