CVE-2023-38555

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.

Published: 2023-07-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-38555 is rated Moderate Risk (40.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-38555

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.23% 0.05% -0.18%
2 2025-11-18 0.05% 0.23% +0.18%
3 2025-04-15 — 0.05% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-38555

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2023-38555

Affected software / configurations for CVE-2023-38555

Vendor Product Version Raw CPE
fujitsu si-r_30b_firmware — cpe:2.3:o:fujitsu:si-r_30b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_130b_firmware — cpe:2.3:o:fujitsu:si-r_130b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_90brin_firmware — cpe:2.3:o:fujitsu:si-r_90brin_firmware:*:*:*:*:*:*:*:*
fujitsu si-r570b_firmware — cpe:2.3:o:fujitsu:si-r570b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r370b_firmware — cpe:2.3:o:fujitsu:si-r370b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r220d_firmware — cpe:2.3:o:fujitsu:si-r220d_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g100_firmware <= 02.54 cpe:2.3:o:fujitsu:si-r_g100_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g200_firmware <= 02.54 cpe:2.3:o:fujitsu:si-r_g200_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g100b_firmware <= 04.12 cpe:2.3:o:fujitsu:si-r_g100b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g110b_firmware <= 04.12 cpe:2.3:o:fujitsu:si-r_g110b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g200b_firmware <= 04.12 cpe:2.3:o:fujitsu:si-r_g200b_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g210_firmware <= 20.52 cpe:2.3:o:fujitsu:si-r_g210_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g211_firmware <= 20.52 cpe:2.3:o:fujitsu:si-r_g211_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g120_firmware <= 20.52 cpe:2.3:o:fujitsu:si-r_g120_firmware:*:*:*:*:*:*:*:*
fujitsu si-r_g121_firmware <= 20.52 cpe:2.3:o:fujitsu:si-r_g121_firmware:*:*:*:*:*:*:*:*
fujitsu sr-m_50ap1_firmware — cpe:2.3:o:fujitsu:sr-m_50ap1_firmware:*:*:*:*:*:*:*:*

References for CVE-2023-38555

cvelogic Threat Intelligence