Vulnerability · Published May 26, 2020 · Assigned by mozilla
CVE-2020-12387
High 8.1
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 1.4% (higher than 73% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.1High
Exploit odds (30 days)1.4%top 26.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.21 | firefox | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.22 | firefox | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.23 | firefox | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.20 | firefox-esr | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.21 | firefox-esr | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.22 | firefox-esr | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.23 | firefox-esr | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.21 | librewolf | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.22 | librewolf | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.23 | librewolf | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.24 | librewolf | 76.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.20 | thunderbird | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.21 | thunderbird | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.22 | thunderbird | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Alpine:v3.23 | thunderbird | 68.8.0-r0 | ALPINE-CVE-2020-12387 |
| Debian:12 | firefox-esr | 68.8.0esr-1 | DEBIAN-CVE-2020-12387 |
| Debian:13 | firefox-esr | 68.8.0esr-1 | DEBIAN-CVE-2020-12387 |
| Debian:14 | firefox-esr | 68.8.0esr-1 | DEBIAN-CVE-2020-12387 |
| Debian:12 | thunderbird | 1:68.8.0-1 | DEBIAN-CVE-2020-12387 |
| Debian:13 | thunderbird | 1:68.8.0-1 | DEBIAN-CVE-2020-12387 |
| Debian:14 | thunderbird | 1:68.8.0-1 | DEBIAN-CVE-2020-12387 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified – before 68.8 |
| Mozilla | Firefox | unspecified – before 76 |
| Mozilla | Thunderbird | unspecified – before 68.8.0 |
References
- https://www.mozilla.org/security/advisories/mfsa2020-18/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-16/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-17/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1545345 x_refsource_MISC
- USN-4373-1 vendor-advisory, x_refsource_UBUNTU
- https://security.gentoo.org/glsa/202005-03 x_refsource_MISC
- https://security.gentoo.org/glsa/202005-04 x_refsource_MISC