CVE-2020-6820: Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
High · CVSS 8.1 (CVSS 3.1)KEV known exploitedEPSS 7.1%, 94th percentilePublished Updated Assigner: mozilla
In CISA’s Known Exploited Vulnerabilities catalog: Mozilla Firefox And Thunderbird Use-After-Free Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
Required action: Apply updates per vendor instructions.
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.
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Mozilla: FirefoxMozilla: Firefox ESRMozilla: Thunderbird
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- bugzilla.mozilla.org/show_bug.cgi (opens in new tab)
- usn.ubuntu.com/4335-1/ (opens in new tab)
- www.mozilla.org/security/advisories/mfsa2020-11/ (opens in new tab)
- www.mozilla.org/security/advisories/mfsa2020-14/ (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)