CVE-2020-6820high
New! CVE Severity Now Using CVSS v3
The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
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.
References
https://www.mozilla.org/security/advisories/mfsa2020-14/
https://www.mozilla.org/security/advisories/mfsa2020-11/
Details
Source: MITRE
Published: 2020-04-24
Updated: 2021-07-21
Type: CWE-415
Risk Information
CVSS v2
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
CVSS v3
Base Score: 8.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.2
Severity: HIGH
Vulnerable Software
Configuration 1
OR
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 150588 | SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2020:14337-1) | Nessus | SuSE Local Security Checks | high |
| 147407 | NewStart CGSL MAIN 4.06 : firefox Multiple Vulnerabilities (NS-SA-2021-0004) | Nessus | NewStart CGSL Local Security Checks | critical |
| 147312 | NewStart CGSL MAIN 4.06 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0002) | Nessus | NewStart CGSL Local Security Checks | critical |
| 145858 | CentOS 8 : thunderbird (CESA-2020:1495) | Nessus | CentOS Local Security Checks | critical |
| 143979 | NewStart CGSL CORE 5.05 / MAIN 5.05 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0093) | Nessus | NewStart CGSL Local Security Checks | critical |
| 143948 | NewStart CGSL CORE 5.05 / MAIN 5.05 : firefox Multiple Vulnerabilities (NS-SA-2020-0097) | Nessus | NewStart CGSL Local Security Checks | critical |
| 143928 | NewStart CGSL CORE 5.04 / MAIN 5.04 : firefox Multiple Vulnerabilities (NS-SA-2020-0064) | Nessus | NewStart CGSL Local Security Checks | critical |
| 143912 | NewStart CGSL CORE 5.04 / MAIN 5.04 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0074) | Nessus | NewStart CGSL Local Security Checks | critical |
| 140283 | NewStart CGSL MAIN 4.05 : firefox Multiple Vulnerabilities (NS-SA-2020-0047) | Nessus | NewStart CGSL Local Security Checks | critical |
| 138776 | NewStart CGSL MAIN 6.01 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0036) | Nessus | NewStart CGSL Local Security Checks | critical |
| 136752 | Amazon Linux 2 : thunderbird (ALAS-2020-1429) | Nessus | Amazon Linux Local Security Checks | critical |
| 136194 | CentOS 7 : thunderbird (CESA-2020:1489) | Nessus | CentOS Local Security Checks | critical |
| 136017 | CentOS 6 : thunderbird (CESA-2020:1488) | Nessus | CentOS Local Security Checks | critical |
| 136007 | openSUSE Security Update : MozillaThunderbird (openSUSE-2020-544) | Nessus | SuSE Local Security Checks | critical |
| 701275 | Mozilla Firefox < 74.0.1 Race Condition | Nessus Network Monitor | Web Clients | high |
| 701273 | Mozilla Firefox ESR < 68.6.1 Race Condition | Nessus Network Monitor | Web Clients | high |
| 135896 | Ubuntu 16.04 LTS : Thunderbird vulnerabilities (USN-4335-1) | Nessus | Ubuntu Local Security Checks | critical |
| 135845 | Scientific Linux Security Update : thunderbird on SL7.x x86_64 (20200416) | Nessus | Scientific Linux Local Security Checks | critical |
| 135810 | Scientific Linux Security Update : firefox on SL7.x x86_64 (20200407) | Nessus | Scientific Linux Local Security Checks | high |
| 135747 | Oracle Linux 8 : thunderbird (ELSA-2020-1495) | Nessus | Oracle Linux Local Security Checks | critical |
| 135716 | Scientific Linux Security Update : thunderbird on SL6.x i386/x86_64 (20200416) | Nessus | Scientific Linux Local Security Checks | critical |
| 135715 | Oracle Linux 7 : thunderbird (ELSA-2020-1489) | Nessus | Oracle Linux Local Security Checks | critical |
| 135692 | RHEL 8 : thunderbird (RHSA-2020:1495) | Nessus | Red Hat Local Security Checks | critical |
| 135691 | RHEL 8 : thunderbird (RHSA-2020:1496) | Nessus | Red Hat Local Security Checks | critical |
| 135687 | RHEL 6 : thunderbird (RHSA-2020:1488) | Nessus | Red Hat Local Security Checks | critical |
| 135684 | RHEL 7 : thunderbird (RHSA-2020:1489) | Nessus | Red Hat Local Security Checks | critical |
| 135578 | openSUSE Security Update : MozillaThunderbird (openSUSE-2020-520) | Nessus | SuSE Local Security Checks | critical |
| 135495 | Debian DLA-2172-1 : thunderbird security update | Nessus | Debian Local Security Checks | critical |
| 135455 | Ubuntu 18.04 LTS / 19.10 : Thunderbird vulnerabilities (USN-4328-1) | Nessus | Ubuntu Local Security Checks | critical |
| 135430 | Oracle Linux 7 : firefox (ELSA-2020-1338) | Nessus | Oracle Linux Local Security Checks | high |
| 135417 | Debian DSA-4656-1 : thunderbird - security update | Nessus | Debian Local Security Checks | critical |
| 135413 | Mozilla Thunderbird < 68.7.0 | Nessus | Windows | critical |
| 135412 | Mozilla Thunderbird < 68.7.0 | Nessus | MacOS X Local Security Checks | critical |
| 135377 | Oracle Linux 8 : firefox (ELSA-2020-1341) | Nessus | Oracle Linux Local Security Checks | high |
| 135363 | Debian DLA-2170-1 : firefox-esr security update | Nessus | Debian Local Security Checks | critical |
| 135361 | CentOS 6 : firefox (CESA-2020:1339) | Nessus | CentOS Local Security Checks | high |
| 135278 | Scientific Linux Security Update : firefox on SL6.x i386/x86_64 (20200407) | Nessus | Scientific Linux Local Security Checks | high |
| 135267 | SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2020:0929-1) | Nessus | SuSE Local Security Checks | high |
| 135266 | SUSE SLES12 Security Update : MozillaFirefox (SUSE-SU-2020:0928-1) | Nessus | SuSE Local Security Checks | high |
| 135263 | openSUSE Security Update : MozillaFirefox (openSUSE-2020-461) | Nessus | SuSE Local Security Checks | high |
| 135254 | RHEL 8 : firefox (RHSA-2020:1341) | Nessus | Red Hat Local Security Checks | high |
| 135242 | RHEL 7 : firefox (RHSA-2020:1338) | Nessus | Red Hat Local Security Checks | high |
| 135241 | RHEL 8 : firefox (RHSA-2020:1340) | Nessus | Red Hat Local Security Checks | high |
| 135240 | RHEL 6 : firefox (RHSA-2020:1339) | Nessus | Red Hat Local Security Checks | high |
| 135229 | Ubuntu 16.04 LTS / 18.04 LTS / 19.10 : firefox vulnerabilities (USN-4317-1) | Nessus | Ubuntu Local Security Checks | high |
| 135219 | Slackware 14.2 / current : mozilla-firefox (SSA:2020-094-01) | Nessus | Slackware Local Security Checks | high |
| 135216 | GLSA-202004-07 : Mozilla Firefox: Multiple vulnerabilities | Nessus | Gentoo Local Security Checks | high |
| 135208 | Debian DSA-4653-1 : firefox-esr - security update | Nessus | Debian Local Security Checks | high |
| 135202 | Mozilla Firefox < 74.0.1 | Nessus | Windows | high |
| 135201 | Mozilla Firefox ESR < 68.6.1 | Nessus | Windows | high |
| 135200 | Mozilla Firefox < 74.0.1 | Nessus | MacOS X Local Security Checks | high |
| 135199 | Mozilla Firefox ESR < 68.6.1 | Nessus | MacOS X Local Security Checks | high |