CVE-2022-28704Network attack vector

Unauthenticated root access via default WAN SSH credentials

Published Jun 13, 2022 · Updated Aug 3, 2024

Improper access control in Rakuten Casa AP_F_V1_4_1 and AP_F_V2_0_0 allows remote attackers to obtain root access through WAN-facing SSH. The SSH access control accepts unchanged default authentication information for a root login while the appliance exposes SSH on its WAN interface. Exposure requires the default WAN SSH setting, Internet connectivity, and unchanged default authentication information; successful access permits arbitrary appliance operations.

CVSS severity7.5
High
EPSS probability2.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Rakuten Casa AP_F_V1_4_1 and AP_F_V2_0_0 allows remote attackers to obtain root access through WAN-facing SSH. The SSH access control accepts unchanged default authentication information for a root login while the appliance exposes SSH on its WAN interface. Exposure requires the default WAN SSH setting, Internet connectivity, and unchanged default authentication information; successful access permits arbitrary appliance operations.

The record

CVE
CVE-2022-28704
Published
Jun 13, 2022
Updated
Aug 3, 2024
Vendor
Rakuten Mobile, Inc.
Product
Rakuten Casa
Classifications
CWE-284, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=version AP_F_V1_4_1 or AP_F_V2_0_0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rakuten Mobile, Inc. · Rakuten Casaversion=version AP_F_V1_4_1 or AP_F_V2_0_0

Published CVSS scores

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
7.5IPACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.8IPAAV:N/AC:L/Au:N/C:C/I:N/A:N
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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.

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-284Improper Access Control
T1078.001Valid Accounts: Default Accounts

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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