CVE-2022-42929Public exploitNetwork attack vector

Persistent denial of service via reentrant printing

Published Dec 22, 2022 · Updated Apr 15, 2025

Denial of service in Firefox before 106, Firefox ESR before 102.4, and Thunderbird before 102.4 allows remote attackers to hang the application. The DOM print path permits a beforeprint handler to invoke window.print() reentrantly, retargeting the null result into new windows without a reentry guard. Opening attacker-controlled web content is required; repeated windows can exhaust memory, and session restore can retrigger the hang.

CVSS severity6.5
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Firefox before 106, Firefox ESR before 102.4, and Thunderbird before 102.4 allows remote attackers to hang the application. The DOM print path permits a beforeprint handler to invoke window.print() reentrantly, retargeting the null result into new windows without a reentry guard. Opening attacker-controlled web content is required; repeated windows can exhaust memory, and session restore can retrigger the hang.

The record

CVE
CVE-2022-42929
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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 <106

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <106
Mozilla · Thunderbirdversion=unspecified <102.4
Mozilla · Firefox ESRversion=unspecified <102.4

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NISTCVSS: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-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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