Vulnerability Monitor

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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 abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

Published

2020-04-24T16:15:13.463

Last Modified

2025-03-21T20:01:36.743

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 8.1 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

8.6

Impact Score

6.4

Weaknesses

Type: Primary
CWE-362
Type: Secondary
CWE-362

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 74.0.1	Yes
Application	mozilla	firefox_esr	< 68.6.1	Yes
Application	mozilla	thunderbird	< 68.7.0	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1626728 Issue Tracking, Permissions Required ([email protected])
https://usn.ubuntu.com/4335-1/ Third Party Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2020-11/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2020-14/ Vendor Advisory ([email protected])
https://bugzilla.mozilla.org/show_bug.cgi?id=1626728 Issue Tracking, Permissions Required (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4335-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2020-11/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2020-14/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)