CVE-2023-38555

Configuration compromise via web-interface authentication bypass

Published Jul 26, 2023 · Updated Nov 14, 2024

Authentication bypass in Fujitsu Si-R and SR-M firmware allows remote attackers to obtain, change, or reset device configurations. The web management interface accepts configuration-management requests without properly authenticating the requester; Fujitsu has not disclosed the responsible endpoint or validation error. Reachability requires access from an adjacent network, and exploitation exposes configuration data or permits configuration changes and resets.

CVSS severity8.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Fujitsu Si-R and SR-M firmware allows remote attackers to obtain, change, or reset device configurations. The web management interface accepts configuration-management requests without properly authenticating the requester; Fujitsu has not disclosed the responsible endpoint or validation error. Reachability requires access from an adjacent network, and exploitation exposes configuration data or permits configuration changes and resets.

The record

CVE
CVE-2023-38555
Published
Jul 26, 2023
Updated
Nov 14, 2024
Vendor
Fujitsu Limited
Product
Si-R G211
Classifications
CWE-287, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 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=V20.52 and earlier

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Fujitsu Limited · Si-R G211version=V20.52 and earlier
Fujitsu Limited · Si-R 30Bversion=All versions
Fujitsu Limited · Si-R G121version=V20.52 and earlier
Fujitsu Limited · SR-M50AP1version=All versions
Fujitsu Limited · Si-R G210version=V20.52 and earlier
Fujitsu Limited · Si-R 370Bversion=All versions
Fujitsu Limited · Si-R G110Bversion=V04.12 and earlier
Fujitsu Limited · Si-R G100Bversion=V04.12 and earlier
Fujitsu Limited · Si-R 130Bversion=All versions
Fujitsu Limited · Si-R 570Bversion=All versions
Fujitsu Limited · Si-R 220Dversion=All versions
Fujitsu Limited · Si-R G120version=V20.52 and earlier
Fujitsu Limited · Si-R G200Bversion=V04.12 and earlier
Fujitsu Limited · Si-R G200version=V02.54 and earlier
Fujitsu Limited · Si-R 90brinversion=All versions
Fujitsu Limited · Si-R G100version=V02.54 and earlier

Published CVSS scores

6.4JPCERT/CCCVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
5.8JPCERT/CCAV:A/AC:H/Au:N/C:P/I:C/A:P
8.8NIST NVDCVSS:3.1/AV:A/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

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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