8.1

CVE-2020-6820

Warnung
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Mozilla ≫ Firefox SwEditionesr Version < 68.6.1
Mozilla ≫ Firefox SwEdition- Version < 74.0.1
Mozilla ≫ Thunderbird Version < 68.7.0

03.11.2021: CISA Known Exploited Vulnerabilities (KEV) Catalog

Mozilla Firefox And Thunderbird Use-After-Free Vulnerability

Schwachstelle

Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

Beschreibung

Apply updates per vendor instructions.

Erforderliche Maßnahmen
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 6.31% 0.927
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd@nist.gov 6.8 8.6 6.4
AV:N/AC:M/Au:N/C:P/I:P/A:P
134c704f-9b21-4f2e-91b3-4a467353bcc0 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

https://usn.ubuntu.com/4335-1/
Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-11/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-14/
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
Issue Tracking
Permissions Required
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820
US Government Resource