CVE-2020-12387 — Race Condition in Mozilla Firefox

CWE-362 — Race ConditionCWE-416 — Use After Free17 documents9 sources
Severity
8.1HIGHNVD
EPSS
1.0%
top 23.00%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedMay 26
Latest updateMay 24

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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.2 | Impact: 5.9

Affected Packages9 packages

▶CVEListV5mozilla/firefoxunspecified — 76
▶NVDmozilla/firefox< 76.0
▶CVEListV5mozilla/firefox_esrunspecified — 68.8
▶NVDmozilla/firefox_esr< 68.8.0
▶Ubuntumozilla/firefox< 76.0.1+build1-0ubuntu0.16.04.1+5

🔴Vulnerability Details

6
GHSA
GHSA-8m69-jh8v-xjx3: A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability↗2022-05-24
▶
OSV
thunderbird vulnerabilities↗2020-05-26
▶
CVEList
CVE-2020-12387: A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability↗2020-05-26
▶
OSV
CVE-2020-12387: A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability↗2020-05-26
▶
OSV
firefox regression↗2020-05-12
▶

📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2020-05-26
▶
Ubuntu
Firefox regression↗2020-05-12
▶
Ubuntu
Firefox vulnerabilities↗2020-05-07
▶
Red Hat
Mozilla: Use-after-free during worker shutdown↗2020-05-05
▶
Debian
CVE-2020-12387: firefox - A race condition when running shutdown code for Web Worker led to a use-after-fr...↗2020
▶

💬Community

2
Bugzilla
CVE-2020-12387 Mozilla: Use-after-free during worker shutdown↗2020-05-05
▶
Bugzilla
CVE-2019-12387 python-twisted: Improper neutralization of CRLF characters in URIs and HTTP methods↗2019-06-12
▶
CVE-2020-12387 — Race Condition in Mozilla Firefox | cvebase