CVE-2022-28287Public exploitNetwork attack vector

Browser crash via inconsistent selection cache

Published Dec 22, 2022 · Updated Apr 16, 2025

Denial of service in Mozilla Firefox before 99 allows context-dependent attackers to crash the browser through crafted page content. Inconsistent ContentCacheInParent text lengths invalidate the selection, causing TSFTextStore to return E_FAIL to text queries and Windows IME processing to terminate Firefox. The attack requires a user to select the crafted text on Windows, and the reported consequence is a recoverable browser crash rather than code execution.

CVSS severity6.5
Medium
EPSS probability0.55%
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 Mozilla Firefox before 99 allows context-dependent attackers to crash the browser through crafted page content. Inconsistent ContentCacheInParent text lengths invalidate the selection, causing TSFTextStore to return E_FAIL to text queries and Windows IME processing to terminate Firefox. The attack requires a user to select the crafted text on Windows, and the reported consequence is a recoverable browser crash rather than code execution.

The record

CVE
CVE-2022-28287
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-664, T1499.004
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 <99

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <99

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-664Improper Control of a Resource Through its Lifetime
T1499.004Application 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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