AEGLIX vulnerability intelligence
CVE-2020-6820
HIGH · CVSS 8.1 · Analyzed
Published: 2020-04-24 · Updated: 2026-06-17 · Source: NVD
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Vulnerability overview
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.
Severity and scoring
- CVSS score
- 8.1 · HIGH
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-362
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Mozilla · Firefox and Thunderbird
- Added to catalog
- 2021-11-03
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2022-05-03
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
Before (exclusive): 68.6.1
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Before (exclusive): 74.0.1
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Before (exclusive): 68.7.0
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
Issue Tracking · Permissions Required
- 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://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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820
US Government Resource