CVE-2022-34470Public exploitNetwork attack vector

Application crash via stale session-history context pointer

Published Dec 22, 2022 · Updated Apr 15, 2025

Use-after-free in nsSHistory in Mozilla Firefox before 102, Firefox ESR before 91.11, and Thunderbird before 102 allows attackers to cause a crash. The root session history retains a raw BrowsingContext pointer after the object is freed, then reload or back-forward navigation dereferences it instead of resolving a live context. Thunderbird before 91.11 is also affected; triggering requires a particular history-navigation and garbage-collection sequence, while mail reading disables scripting.

CVSS severity9.8
Critical
EPSS probability1.06%
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 nsSHistory in Mozilla Firefox before 102, Firefox ESR before 91.11, and Thunderbird before 102 allows attackers to cause a crash. The root session history retains a raw BrowsingContext pointer after the object is freed, then reload or back-forward navigation dereferences it instead of resolving a live context. Thunderbird before 91.11 is also affected; triggering requires a particular history-navigation and garbage-collection sequence, while mail reading disables scripting.

The record

CVE
CVE-2022-34470
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
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 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 <102

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <102
Mozilla · Thunderbirdversion=unspecified <102; version=unspecified <91.11
Mozilla · Firefox ESRversion=unspecified <91.11

Published CVSS scores

9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-416Use After Free
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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