CVE-2020-6820
Summary
| CVE | CVE-2020-6820 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2020-04-24 16:15:00 UTC |
| Updated | 2022-07-12 17:42:00 UTC |
| 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. |
Risk And Classification
EPSS: 0.031300000 probability, percentile 0.867990000 (date 2026-04-01)
CISA KEV: Listed on 2021-11-03; due 2022-05-03; ransomware use Unknown
Problem Types: CWE-362
CISA Known Exploited Vulnerability
| Vendor | Mozilla |
|---|---|
| Product | Firefox and Thunderbird |
| Name | Mozilla Firefox And Thunderbird Use-After-Free Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | https://nvd.nist.gov/vuln/detail/CVE-2020-6820 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Mozilla | Firefox | All | All | All | All |
| Application | Mozilla | Firefox | All | All | All | All |
| Application | Mozilla | Firefox Esr | All | All | All | All |
| Application | Mozilla | Firefox Esr | All | All | All | All |
| Application | Mozilla | Thunderbird | All | All | All | All |
| Application | Mozilla | Thunderbird | All | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Security Vulnerabilities fixed in Firefox 74.0.1 and Firefox ESR 68.6.1 — Mozilla | MISC | www.mozilla.org | Vendor Advisory |
| Access Denied | MISC | bugzilla.mozilla.org | Issue Tracking, Permissions Required |
| USN-4335-1: Thunderbird vulnerabilities | Ubuntu security notices | UBUNTU | usn.ubuntu.com | Third Party Advisory |
| Security Vulnerabilities fixed in Thunderbird 68.7.0 — Mozilla | MISC | www.mozilla.org | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 296074 Oracle Solaris 11.4 Support Repository Update (SRU) 22.69.4 Missing (CPUAPR2020)
- 376946 Alibaba Cloud Linux Security Update for firefox (ALINUX2-SA-2020:0085)
- 500928 Alpine Linux Security Update for firefox-esr
- 500947 Alpine Linux Security Update for firefox
- 501077 Alpine Linux Security Update for mozjs68
- 502373 Alpine Linux Security Update for thunderbird
- 503832 Alpine Linux Security Update for firefox
- 505441 Alpine Linux Security Update for thunderbird