CVE-2022-22742Public exploitNetwork attack vector

Application crash via stale editor positions

Published Dec 22, 2022 · Updated Apr 16, 2025

Out-of-bounds access in Mozilla Firefox before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 allows remote attackers to crash applications. In the DOM editor, whitespace replacement fails to update split and insertion positions, leaving nsTextFragment::CharAt to read through an invalid offset. A user must open attacker-controlled content that invokes text-editing operations; ordinary Thunderbird message reading disables scripting, limiting exposure there to browser-like contexts.

CVSS severity6.5
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Mozilla Firefox before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 allows remote attackers to crash applications. In the DOM editor, whitespace replacement fails to update split and insertion positions, leaving nsTextFragment::CharAt to read through an invalid offset. A user must open attacker-controlled content that invokes text-editing operations; ordinary Thunderbird message reading disables scripting, limiting exposure there to browser-like contexts.

The record

CVE
CVE-2022-22742
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-125, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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=unspecified <96

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <96
Mozilla · Thunderbirdversion=unspecified <91.5
Mozilla · Firefox ESRversion=unspecified <91.5

Published CVSS scores

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1203Exploitation for Client Execution

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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