CVE-2023-4048Public exploitNetwork attack vector

Browser crash via failed AttrArray memory reallocation

Published Aug 1, 2023 · Updated Feb 13, 2025

An out-of-bounds read in Mozilla Firefox before 116 and Firefox ESR before 102.14 or 115.1 allows remote attackers to crash the browser. After AttrArray::GrowBy fails to reallocate memory, DOMParser attribute processing reaches Element::BindToTree with an inconsistent array state and reads out of bounds. Triggering the flaw requires DOMParser.parseFromString to process attacker-controlled HTML while memory is nearly exhausted; the demonstrated consequence is an application crash.

CVSS severity7.5
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Mozilla Firefox before 116 and Firefox ESR before 102.14 or 115.1 allows remote attackers to crash the browser. After AttrArray::GrowBy fails to reallocate memory, DOMParser attribute processing reaches Element::BindToTree with an inconsistent array state and reads out of bounds. Triggering the flaw requires DOMParser.parseFromString to process attacker-controlled HTML while memory is nearly exhausted; the demonstrated consequence is an application crash.

The record

CVE
CVE-2023-4048
Published
Aug 1, 2023
Updated
Feb 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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=0 <116
  2. Affected versionversion=unspecified <116

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <116; version=unspecified <116
Mozilla · Firefox ESRversion=0 <102.14; version=0 <115.1; version=unspecified <102.14; version=unspecified <115.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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