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CVE-2020-6820

HIGHCISA KEV

8.1

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.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/24/2020

Last Modified11/4/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorMozilla

ProductFirefox and Thunderbird

Vulnerability NameMozilla Firefox And Thunderbird Use-After-Free Vulnerability

KEV Date Added2021-11-03

Remediation Due Date2022-05-03

Ransomware UseUnknown

Affected Products

mozilla:firefoxmozilla:thunderbird

Weaknesses (CWE)

CWE-362CWE-362

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1626728(security@mozilla.org)

https://usn.ubuntu.com/4335-1/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2020-11/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2020-14/(security@mozilla.org)

https://bugzilla.mozilla.org/show_bug.cgi?id=1626728(af854a3a-2127-422b-91ae-364da2661108)

https://usn.ubuntu.com/4335-1/(af854a3a-2127-422b-91ae-364da2661108)

https://www.mozilla.org/security/advisories/mfsa2020-11/(af854a3a-2127-422b-91ae-364da2661108)

https://www.mozilla.org/security/advisories/mfsa2020-14/(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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