Vulnerability · Published Jul 9, 2020 · Assigned by mozilla
CVE-2020-12420
High 8.8
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.9%top 20.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
When trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.21 | firefox | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.22 | firefox | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.23 | firefox | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.20 | firefox-esr | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.21 | firefox-esr | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.22 | firefox-esr | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.23 | firefox-esr | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.21 | librewolf | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.22 | librewolf | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.23 | librewolf | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.24 | librewolf | 78.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.20 | thunderbird | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.21 | thunderbird | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.22 | thunderbird | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Alpine:v3.23 | thunderbird | 68.10.0-r0 | ALPINE-CVE-2020-12420 |
| Debian:12 | firefox-esr | 68.10.0esr-1 | DEBIAN-CVE-2020-12420 |
| Debian:13 | firefox-esr | 68.10.0esr-1 | DEBIAN-CVE-2020-12420 |
| Debian:14 | firefox-esr | 68.10.0esr-1 | DEBIAN-CVE-2020-12420 |
| Debian:12 | thunderbird | 1:68.10.0-1 | DEBIAN-CVE-2020-12420 |
| Debian:13 | thunderbird | 1:68.10.0-1 | DEBIAN-CVE-2020-12420 |
| Debian:14 | thunderbird | 1:68.10.0-1 | DEBIAN-CVE-2020-12420 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified – before 68.10 |
| Mozilla | Firefox | unspecified – before 78 |
| Mozilla | Thunderbird | unspecified – before 68.10.0 |
References
- https://www.mozilla.org/security/advisories/mfsa2020-24/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-26/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-25/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1643437 x_refsource_MISC
- openSUSE-SU-2020:0967 vendor-advisory, x_refsource_SUSE
- openSUSE-SU-2020:0982 vendor-advisory, x_refsource_SUSE
- openSUSE-SU-2020:0983 vendor-advisory, x_refsource_SUSE
- openSUSE-SU-2020:1017 vendor-advisory, x_refsource_SUSE
- USN-4421-1 vendor-advisory, x_refsource_UBUNTU
- GLSA-202007-09 vendor-advisory, x_refsource_GENTOO
- GLSA-202007-10 vendor-advisory, x_refsource_GENTOO