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CVE-2019-9791· NVD / CVE Program· CNA mozilla

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available
Published
Apr 26, 2019
Updated
Jun 16, 2026
EPSS
19.9% · 97th percentile
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Report tools

JSON

Action score

45

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
6 / 30 · 19.9%

Affected systems

VendorProduct
mozillafirefox
mozillathunderbird
redhatenterprise linux
redhatenterprise linux eus
redhatenterprise linux server aus
redhatenterprise linux server tus

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 60.6.0
  • mozilla firefoxbefore 66.0
  • mozilla thunderbirdbefore 60.6.0
  • redhat enterprise linux8.0
  • redhat enterprise linux eus8.1
  • redhat enterprise linux eus8.2
  • redhat enterprise linux eus8.4
  • redhat enterprise linux server aus8.2
  • redhat enterprise linux server aus8.4
  • redhat enterprise linux server tus8.2
  • redhat enterprise linux server tus8.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 66affected

  • Mozilla Firefox ESR

    • unspecified and later · before 60.6affected

  • Mozilla Thunderbird

    • unspecified and later · before 60.6affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12firefox-esrbefore 60.6.0esr-160.6.0esr-1
Debian:12thunderbirdbefore 1:60.6.1-11:60.6.1-1
Debian:8firefox-esrbefore 60.6.0esr-1~deb8u160.6.0esr-1~deb8u1
Debian:8thunderbirdbefore 1:60.6.1-1~deb8u11:60.6.1-1~deb8u1
Debian:9firefox-esrbefore 60.6.0esr-1~deb9u160.6.0esr-1~deb9u1
Debian:9thunderbirdbefore 1:60.6.1-1~deb9u11:60.6.1-1~deb9u1
openSUSE:Leap 15.0MozillaFirefoxbefore 60.6.1-lp150.3.45.160.6.1-lp150.3.45.1
openSUSE:Leap 15.0MozillaThunderbirdbefore 60.6.1-lp150.3.37.160.6.1-lp150.3.37.1
Red Hat:enterprise_linux:6::clientfirefoxbefore 0:60.6.0-3.el6_100:60.6.0-3.el6_10
Red Hat:enterprise_linux:6::clientfirefox-debuginfobefore 0:60.6.0-3.el6_100:60.6.0-3.el6_10
Red Hat:enterprise_linux:6::clientthunderbirdbefore 0:60.6.1-1.el6_100:60.6.1-1.el6_10
Red Hat:enterprise_linux:6::clientthunderbird-debuginfobefore 0:60.6.1-1.el6_100:60.6.1-1.el6_10
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:60.6.0-3.el7_60:60.6.0-3.el7_6
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:60.6.0-3.el7_60:60.6.0-3.el7_6
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:60.6.1-1.el7_60:60.6.1-1.el7_6
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:60.6.1-1.el7_60:60.6.1-1.el7_6
Red Hat:enterprise_linux:8::appstreamfirefoxbefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamfirefox-debuginfobefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamfirefox-debugsourcebefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamthunderbirdbefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamthunderbird-debuginfobefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamthunderbird-debugsourcebefore 0:60.6.1-1.el80:60.6.1-1.el8
SUSE:Linux Enterprise Module for Desktop Applications 15MozillaFirefoxbefore 60.6.1-3.29.360.6.1-3.29.3
SUSE:Linux Enterprise Workstation Extension 15MozillaThunderbirdbefore 60.6.1-3.28.160.6.1-3.28.1

+2

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now
  • CVE-2013-1690Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properKEV
    86Now
  • CVE-2019-17026Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion.KEV
    79This week
  • CVE-2024-9680An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines.KEV
    76This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:firefox-esr60.6.0esr-1 · Debian:12Package registry (OSV)
debian:thunderbird1:60.6.1-1 · Debian:12Package registry (OSV)
opensuse:MozillaFirefox60.6.1-lp150.3.45.1 · openSUSE:Leap 15.0Package registry (OSV)
opensuse:MozillaThunderbird60.6.1-lp150.3.37.1 · openSUSE:Leap 15.0Package registry (OSV)
red hat:firefox0:60.6.0-3.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debuginfo0:60.6.0-3.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debugsource0:60.6.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:thunderbird0:60.6.1-1.el6_10 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:thunderbird-debuginfo0:60.6.1-1.el6_10 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:thunderbird-debugsource0:60.6.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:MozillaFirefox60.6.1esr-109.63.2 · SUSE:OpenStack Cloud 7Package registry (OSV)
suse:MozillaThunderbird60.6.1-3.28.1 · SUSE:Linux Enterprise Workstation Extension 15Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1
  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2019-03-26
Proof-of-concept repository on GitHubstars:22021-09-08

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-32 d
  2. Published
  3. TodaySep 30, 2026+2714 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records