CVE-2022-45416Network attack vector

Keystroke disclosure via fixed-address event strings

Published Dec 22, 2022 · Updated Apr 15, 2025

Side-channel exposure in Mozilla Firefox before 107, Firefox ESR before 102.5, and Thunderbird before 102.5 allows remote attackers to infer keystrokes. The DOM UI Events code stored keyboard-event strings such as KeyA at fixed, widely shared addresses, allowing Prime+Probe cache timing to distinguish referenced keys. A victim must generate keyboard events while the cache probe runs; successful exploitation reveals pressed keys without modifying data or interrupting the application.

CVSS severity6.5
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Side-channel exposure in Mozilla Firefox before 107, Firefox ESR before 102.5, and Thunderbird before 102.5 allows remote attackers to infer keystrokes. The DOM UI Events code stored keyboard-event strings such as KeyA at fixed, widely shared addresses, allowing Prime+Probe cache timing to distinguish referenced keys. A victim must generate keyboard events while the cache probe runs; successful exploitation reveals pressed keys without modifying data or interrupting the application.

The record

CVE
CVE-2022-45416
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-203, T1056.001
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <107

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <107
Mozilla · Thunderbirdversion=unspecified <102.5
Mozilla · Firefox ESRversion=unspecified <102.5

Published CVSS scores

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

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-203Observable Discrepancy
T1056.001Input Capture: Keylogging

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo