CVE-2019-9795

Mozilla: Type-confusion in IonMonkey JIT compiler

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Una vulnerabilidad de confusión de tipo en compilador IonMonkey just-in-time (JIT) podría ser utilizado por JavaScript malicioso para desencadenar un fallo potencialmente explotable. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 60.6, Firefox ESR versiones anteriores a 60.6 y Firefox versiones anteriores a 66.

It was discovered that Thunderbird allowed PAC files to specify that requests to localhost are sent through the proxy to another server. If proxy auto-detection is enabled, an attacker could potentially exploit this to conduct attacks on local services and tools. Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, or execute arbitrary code. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-03-14 CVE Reserved
2019-03-20 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-617: Reachable Assertion
CWE-787: Out-of-bounds Write
CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:0966	2020-08-24
https://access.redhat.com/errata/RHSA-2019:1144	2020-08-24
https://www.mozilla.org/security/advisories/mfsa2019-07	2020-08-24
https://www.mozilla.org/security/advisories/mfsa2019-08	2020-08-24
https://www.mozilla.org/security/advisories/mfsa2019-11	2020-08-24
https://access.redhat.com/security/cve/CVE-2019-9795	2019-05-13
https://bugzilla.redhat.com/show_bug.cgi?id=1690680	2019-05-13

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"				< 66.0 Search vendor "Mozilla" for product "Firefox" and version " < 66.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 60.6 Search vendor "Mozilla" for product "Firefox Esr" and version " < 60.6"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 60.6 Search vendor "Mozilla" for product "Thunderbird" and version " < 60.6"		-		Affected