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The vulnerability of the IonMonkey JIT-compiler for Firefox and Firefox ESR browsers lies in the access to resources through incompatible types. This allows attackers to gain access to confidential data, compromise its integrity, and cause service failures.

🗓️ 20 Jan 2020 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 2 Views

IonMonkey JIT in Firefox exposes resources via incompatible types, enabling data access disruption.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
0day.today		Mozilla Firefox 72 IonMonkey - JIT Type Confusion Exploit
13 May 202100:00
–zdt
0day.today		Mozilla Firefox 67 - Array.pop JIT Type Confusion Exploit
2 Feb 202200:00
–zdt
ALT Linux		Security fix for the ALT Linux 10 package thunderbird version 68.4.1-alt1
11 Jan 202000:00
–altlinux
GithubExploit		Exploit for Type Confusion in Mozilla Firefox
27 Aug 202019:32
–githubexploit
Tenable Nessus		Mozilla Firefox < 72.0.1 Type Confusion (mfsa2020-03)
8 Jan 202000:00
–nessus
Tenable Nessus		Mozilla Firefox ESR < 68.4.1 Type Confusion (mfsa2020-03)
8 Jan 202000:00
–nessus
Tenable Nessus		Amazon Linux 2 : thunderbird (ALAS-2020-1393)
13 Feb 202000:00
–nessus
Tenable Nessus		CentOS 8 : firefox (CESA-2020:0111)
1 Feb 202100:00
–nessus
Tenable Nessus		CentOS 7 : firefox (RHSA-2020:0085)
16 Jan 202000:00
–nessus
Tenable Nessus		CentOS 6 : firefox (RHSA-2020:0086)
15 Jan 202000:00
–nessus
Rows per page
Vulners
Node
mozillafirefoxRange<72.0.1
OR
mozillafirefox_esrRange<68.4.1

Data

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22 Oct 2025 00:00Current
8High risk
Vulners AI Score8
CVSS 38.8
CVSS 210
EPSS0.46589
IonMonkey compilerFirefox browserincompatible typesdata accessdata type conversiondisruption
2