CVE-2020-12405

Mozilla: Use-after-free in SharedWorkerService

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

Cuando se navega una página maliciosa, podría ocurrir una condición de carrera en nuestro SharedWorkerService y conllevar a un bloqueo potencialmente explotable. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 68.9.0, Firefox versiones anteriores a 77 y Firefox ESR versiones anteriores a 68.9

The Mozilla Foundation Security Advisory describes this flaw as: When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash.

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 68.9.0 ESR. Issues addressed include a use-after-free vulnerability.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-04-28 CVE Reserved
2020-06-03 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2025-04-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416: Use After Free

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC
https://bugzilla.mozilla.org/show_bug.cgi?id=1631618	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://usn.ubuntu.com/4421-1	2022-05-03
https://www.mozilla.org/security/advisories/mfsa2020-20	2022-05-03
https://www.mozilla.org/security/advisories/mfsa2020-21	2022-05-03
https://www.mozilla.org/security/advisories/mfsa2020-22	2022-05-03
https://access.redhat.com/security/cve/CVE-2020-12405	2020-06-19
https://bugzilla.redhat.com/show_bug.cgi?id=1843313	2020-06-19

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Firefox Search vendor "Mozilla" for product "Firefox"				< 77.0 Search vendor "Mozilla" for product "Firefox" and version " < 77.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 68.9.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 68.9.0"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 68.9.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 68.9.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04"		lts		Affected