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CVE Record

CVE-2023-38555: Authentication bypass vulnerability in Fujitsu network devices Si-R series and SR-M series allows a network...

Authentication bypass vulnerability in Fujitsu network devices Si-R series and SR-M series allows a network-adjacent unauthenticated attacker to obtain, change, and/or reset configuration settings of the affected products. Affected products and versions are as follows: Si-R 30B all versions, Si-R 130B all versions, Si-R 90brin all versions, Si-R570B all versions, Si-R370B all versions, Si-R220D all versions, Si-R G100 V02.54 and earlier, Si-R G200 V02.54 and earlier, Si-R G100B V04.12 and earlier, Si-R G110B V04.12 and earlier, Si-R G200B V04.12 and earlier, Si-R G210 V20.52 and earlier, Si-R G211 V20.52 and earlier, Si-R G120 V20.52 and earlier, Si-R G121 V20.52 and earlier, and SR-M 50AP1 all versions.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Some Fujitsu Si-R routers and SR-M access point products can let a nearby unauthenticated attacker view, change, or reset device configuration. That could disrupt routing, weaken network controls, or support further intrusion if these devices are reachable from untrusted adjacent networks.

Executive priority

Treat this as a high-priority infrastructure exposure if affected Fujitsu devices are in production. The issue can affect network configuration integrity, but urgency should be calibrated by confirmed device presence and management-plane reachability.

Technical view

CVE-2023-38555 is an authentication bypass affecting listed Fujitsu Si-R series and SR-M 50AP1 devices. The source bundle says a network-adjacent unauthenticated attacker may obtain, change, or reset configuration settings. No CVSS score, CWE, exploit details, or confirmed fixed versions are provided in the bundle.

Likely exposure

Exposure is limited to organizations operating the named Fujitsu Si-R or SR-M 50AP1 models, especially where management or configuration access is reachable from adjacent networks, branch LANs, Wi-Fi segments, or shared infrastructure networks.

Exploitation context

The bundle does not state active exploitation, and KEV is false. The described attacker is network-adjacent and unauthenticated, so risk depends heavily on local network access and management-plane isolation.

Researcher notes

Evidence is incomplete for scoring and remediation specifics: the bundle has no CVSS, CWE, proof-of-concept status, or explicit patch names. Analysis should focus on asset confirmation, firmware comparison, adjacency assumptions, and vendor advisory review rather than exploit reproduction.

Mitigation direction

  • Inventory all Fujitsu Si-R and SR-M network devices against the affected model list.
  • Check Fujitsu and JVN guidance for fixed firmware, replacements, or operational mitigations.
  • Restrict management access to trusted administration networks only.
  • Remove affected devices from shared or untrusted adjacent segments where possible.
  • Back up known-good configurations before remediation changes.

Validation and detection

  • Confirm exact model and firmware version for each Fujitsu network device.
  • Compare each device against the affected versions listed in the CVE record.
  • Verify management interfaces are not reachable from untrusted adjacent networks.
  • Review device logs for unexpected configuration changes or reset events.
  • Document devices with all-version exposure separately for vendor follow-up.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2023-38555 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Fujitsu LimitedSi-R 30BAll versionsListed
Fujitsu LimitedSi-R 130BAll versionsListed
Fujitsu LimitedSi-R 90brinAll versionsListed
Fujitsu LimitedSi-R570BAll versionsListed
Fujitsu LimitedSi-R370BAll versionsListed
Fujitsu LimitedSi-R220DAll versionsListed
Fujitsu LimitedSi-R G100V02.54 and earlierListed
Fujitsu LimitedSi-R G200V02.54 and earlierListed
Fujitsu LimitedSi-R G100BV04.12 and earlierListed
Fujitsu LimitedSi-R G110BV04.12 and earlierListed
Fujitsu LimitedSi-R G200BV04.12 and earlierListed
Fujitsu LimitedSi-R G210V20.52 and earlierListed
Fujitsu LimitedSi-R G211V20.52 and earlierListed
Fujitsu LimitedSi-R G120V20.52 and earlierListed
Fujitsu LimitedSi-R G121V20.52 and earlierListed
Fujitsu LimitedSR-M 50AP1All versionsListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.