Skip to content
Noroxi
CVE-2024-4367· NVD / CVE Program· CNA mozilla

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context.

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

HighCVSS 8.8 · v3.1—Proof of concept Fix available
Published
May 14, 2024
Updated
Jun 17, 2026
EPSS
70.7% · 99th percentile
Follow this CVE

Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.

Report tools

JSON

Action score

56

Plan

Add it to your regular patch cycle.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
21 / 30 · 70.7%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
mozillafirefox
mozillathunderbird
debiandebian linux
open-xchangeopen-xchange appsuite frontend

Affected versions

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

  • debian debian linux10.0
  • mozilla firefoxbefore 115.11.0
  • mozilla firefoxbefore 126.0
  • mozilla thunderbirdbefore 115.11.0
  • open-xchange open-xchange appsuite frontendbefore 7.10.6
  • open-xchange open-xchange appsuite frontend7.10.6

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 126affected

  • Mozilla Firefox ESR

    • unspecified and later · before 115.11affected

  • Mozilla Thunderbird

    • unspecified and later · before 115.11affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8firefoxbefore 115.11.0-1.el8_10.alma.1115.11.0-1.el8_10.alma.1
AlmaLinux:8thunderbirdbefore 115.11.0-1.el8_10.alma.1115.11.0-1.el8_10.alma.1
AlmaLinux:8webkit2gtk3before 2.52.5-1.el8_102.52.5-1.el8_10
AlmaLinux:8webkit2gtk3-develbefore 2.52.5-1.el8_102.52.5-1.el8_10
AlmaLinux:8webkit2gtk3-jscbefore 2.52.5-1.el8_102.52.5-1.el8_10
AlmaLinux:8webkit2gtk3-jsc-develbefore 2.52.5-1.el8_102.52.5-1.el8_10
AlmaLinux:9firefoxbefore 115.11.0-1.el9_4.alma.1115.11.0-1.el9_4.alma.1
AlmaLinux:9firefox-x11before 115.11.0-1.el9_4.alma.1115.11.0-1.el9_4.alma.1
AlmaLinux:9thunderbirdbefore 115.11.0-1.el9_4.alma.1115.11.0-1.el9_4.alma.1
AlmaLinux:9webkit2gtk3before 2.52.5-1.el9_82.52.5-1.el9_8
AlmaLinux:9webkit2gtk3-develbefore 2.52.5-1.el9_82.52.5-1.el9_8
AlmaLinux:9webkit2gtk3-jscbefore 2.52.5-1.el9_82.52.5-1.el9_8
AlmaLinux:9webkit2gtk3-jsc-develbefore 2.52.5-1.el9_82.52.5-1.el9_8
Debian:10firefox-esrbefore 115.11.0esr-1~deb10u1115.11.0esr-1~deb10u1
Debian:10thunderbirdbefore 1:115.11.0-1~deb10u11:115.11.0-1~deb10u1
Debian:11firefox-esrbefore 115.11.0esr-1~deb11u1115.11.0esr-1~deb11u1
Debian:11odoobefore 14.0.0+dfsg.2-7+deb11u214.0.0+dfsg.2-7+deb11u2
Debian:11thunderbirdbefore 1:115.11.0-1~deb11u11:115.11.0-1~deb11u1
Debian:12firefox-esrbefore 115.11.0esr-1~deb12u1115.11.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:115.11.0-1~deb12u11:115.11.0-1~deb12u1
Debian:12webkit2gtkall versions—
Debian:12wpewebkitall versions—
Debian:13firefox-esrbefore 115.11.0esr-1115.11.0esr-1
Debian:13thunderbirdbefore 1:115.11.0-11:115.11.0-1

+96

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
almalinux:firefox115.11.0-1.el9_4.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:firefox-x11115.11.0-1.el9_4.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird115.11.0-1.el9_4.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:webkit2gtk32.52.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:webkit2gtk3-devel2.52.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:webkit2gtk3-jsc2.52.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:webkit2gtk3-jsc-devel2.52.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:firefox-esr115.11.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:odoo14.0.0+dfsg.2-7+deb11u2 · Debian:11Package registry (OSV)
debian:thunderbird1:115.11.0-1~deb12u1 · Debian:12Package registry (OSV)
debian:webkit2gtk2.52.5-1~deb13u1 · Debian:13Package registry (OSV)
debian:wpewebkit2.52.5-1 · Debian:14Package registry (OSV)
npm:pdfjs-dist4.2.67Package registry (OSV)
opensuse:MozillaFirefox115.11.0-150200.152.137.2 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:MozillaThunderbird115.11.0-150200.8.160.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:webkit2gtk32.52.5-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:webkit2gtk3-soup22.52.5-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:webkit2gtk42.52.5-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:firefox0:115.11.0-1.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debuginfo0:115.11.0-1.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debugsource0:115.11.0-1.el8_2 · Red Hat:rhel_aus:8.2::appstreamPackage registry (OSV)
red hat:firefox-x110:115.11.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird0:115.11.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:115.11.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:115.11.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:webkit2gtk30:2.52.5-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:webkit2gtk3-debuginfo0:2.52.5-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:webkit2gtk3-debugsource0:2.52.5-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:webkit2gtk3-devel0:2.52.5-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:webkit2gtk3-devel-debuginfo0:2.52.5-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+9

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 ×26

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 entryremote2025-04-22
Proof-of-concept repository on GitHubstars:02025-04-06
Proof-of-concept repository on GitHubstars:02025-04-12
Proof-of-concept repository on GitHubstars:2022024-05-20
Proof-of-concept repository on GitHubstars:562024-05-20
Proof-of-concept repository on GitHubstars:112024-05-22
Proof-of-concept repository on GitHubstars:42024-05-22
Proof-of-concept repository on GitHubstars:12024-05-23
Proof-of-concept repository on GitHubstars:122024-06-13
Proof-of-concept repository on GitHubstars:102024-06-17
Proof-of-concept repository on GitHubstars:62024-06-19
Proof-of-concept repository on GitHubstars:52024-09-04

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. Published
  2. First PoC+5 d
  3. TodaySep 30, 2026+869 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.

Variant candidates

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

  • CVE-2023-4583246 days apartBrowsing Context potentially not cleared when closing Private Window
    30Monitor
  • CVE-2024-155684 days apartThe incorrect object was checked for NULL in the built-in profiler, potentially leading to invalid memory access and undefined behavior.
    26Monitor
  • CVE-2023-23602347 days apartContent Security Policy wasn't being correctly applied to WebSockets in WebWorkers
    26Monitor
  • CVE-2025-10532490 days apartIncorrect boundary conditions in the JavaScript: GC component
    26Monitor

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.
  • A user must open a link or visit a page.
  • 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
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-754 · Improper Check for Unusual or Exceptional Conditions

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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