Overview
- 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.
- Source
- security@mozilla.org
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 8.1
- Impact score
- 5.9
- Exploitability score
- 2.2
- Vector string
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- HIGH
CVSS 2.0
- Type
- Primary
- Base score
- 6.8
- Impact score
- 6.4
- Exploitability score
- 8.6
- Vector string
- AV:N/AC:M/Au:N/C:P/I:P/A:P
Known exploits
Data from CISA
- Vulnerability name
- Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
- Exploit added on
- Nov 3, 2021
- Exploit action due
- May 3, 2022
- Required action
- Apply updates per vendor instructions.
Weaknesses
- nvd@nist.gov
- CWE-362
Social media
- Hype score
- Not currently trending
Configurations
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{
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{
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"versionEndExcluding": "74.0.1"
},
{
"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*",
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"matchCriteriaId": "DF6BBA3E-8B43-4D39-BE34-9D3E3A6A10CB",
"versionEndExcluding": "68.6.1"
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"operator": "OR"
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]