CVE-2022-22758Public exploitNetwork attack vector

Account actions via USSD-bearing tel links

Published Dec 22, 2022 · Updated Apr 16, 2025

Improper tel-link handling in Firefox for Android before 97 allows remote attackers to initiate USSD account actions after user dialing. GeckoSession.onLoadRequest forwarded tel URIs containing an asterisk and trailing USSD code to the Android dialer instead of rejecting the invalid scheme. Exploitation requires a user to click the crafted link and dial on a susceptible phone or carrier, where the code can perform account actions.

CVSS severity8.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper tel-link handling in Firefox for Android before 97 allows remote attackers to initiate USSD account actions after user dialing. GeckoSession.onLoadRequest forwarded tel URIs containing an asterisk and trailing USSD code to the Android dialer instead of rejecting the invalid scheme. Exploitation requires a user to click the crafted link and dial on a susceptible phone or carrier, where the code can perform account actions.

The record

CVE
CVE-2022-22758
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-319, T1204.001
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 <97

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <97

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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-319Cleartext Transmission of Sensitive Information
T1204.001User Execution Malicious Link

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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