CVE-2022-1196Network attack vector

Application crash via retained VR process reference

Published Dec 22, 2022 · Updated Apr 16, 2025

Use-after-free in Mozilla Firefox ESR and Thunderbird before 91.8 allows remote attackers to crash the application through VR process handling. VRProcessParent::InitAfterConnect dereferences a retained object reference after failed process startup destroys the referenced object. A compromised content process is the gate, and ordinary Thunderbird email viewing does not expose the flaw because scripting is disabled.

CVSS severity6.5
Medium
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Mozilla Firefox ESR and Thunderbird before 91.8 allows remote attackers to crash the application through VR process handling. VRProcessParent::InitAfterConnect dereferences a retained object reference after failed process startup destroys the referenced object. A compromised content process is the gate, and ordinary Thunderbird email viewing does not expose the flaw because scripting is disabled.

The record

CVE
CVE-2022-1196
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Thunderbird
Classifications
CWE-416, 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 <91.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Thunderbirdversion=unspecified <91.8
Mozilla · Firefox ESRversion=unspecified <91.8

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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