CVE-2024-9936Public exploitNetwork attack vector

Browser crash via invalid selection range caching

Published Oct 14, 2024 · Updated Nov 6, 2024

Undefined behavior in Firefox before 131.0.3 allows remote attackers to crash the browser through a crafted webpage. SelectionNodeCache::MaybeCollect populates the selected-node cache by iterating an invalid StaticRange without first checking that the range is valid, which dereferences an invalid node during selected-text painting. Exploitation requires user interaction with attacker-controlled page content; the documented consequence is a browser crash, with no reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined behavior in Firefox before 131.0.3 allows remote attackers to crash the browser through a crafted webpage. SelectionNodeCache::MaybeCollect populates the selected-node cache by iterating an invalid StaticRange without first checking that the range is valid, which dereferences an invalid node during selected-text painting. Exploitation requires user interaction with attacker-controlled page content; the documented consequence is a browser crash, with no reported data disclosure or modification.

The record

CVE
CVE-2024-9936
Published
Oct 14, 2024
Updated
Nov 6, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-362
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <131.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <131.0.3

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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