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Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived

A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.9% exploitation probability (EPSS)

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AnalysisAI

Cross-site scripting vulnerability in Hikari Denwa router/Home GateWay (Hikari Denwa router/Home GateWay provided by NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION PR-S300NE/RT-S300NE/RV-S340NE. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Cross-site scripting vulnerability in Hikari Denwa router/Home GateWay (Hikari Denwa router/Home GateWay provided by NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION PR-S300NE/RT-S300NE/RV-S340NE firmware version Ver. 19.41 and earlier, PR-S300HI/RT-S300HI/RV-S340HI firmware version Ver.19.01.0005 and earlier, PR-S300SE/RT-S300SE/RV-S340SE firmware version Ver.19.40 and earlier, PR-400NE/RT-400NE/RV-440NE firmware version Ver.7.42 and earlier, PR-400KI/RT-400KI/RV-440KI firmware version Ver.07.00.1010 and earlier, PR-400MI/RT-400MI/RV-440MI firmware version Ver. 07.00.1012 and earlier, PR-500KI/RT-500KI firmware version Ver.01.00.0090 and earlier, RS-500KI firmware version Ver.01.00.0070 and earlier, PR-500MI/RT-500MI firmware version Ver.01.01.0014 and earlier, and RS-500MI firmware version Ver.03.01.0019 and earlier, and Hikari Denwa router/Home GateWay provided by NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION PR-S300NE/RT-S300NE/RV-S340NE firmware version Ver. 19.41 and earlier, PR-S300HI/RT-S300HI/RV-S340HI firmware version Ver.19.01.0005 and earlier, PR-S300SE/RT-S300SE/RV-S340SE firmware version Ver.19.40 and earlier, PR-400NE/RT-400NE/RV-440NE firmware version Ver.7.42 and earlier, PR-400KI/RT-400KI/RV-440KI firmware version Ver.07.00.1010 and earlier, PR-400MI/RT-400MI/RV-440MI firmware version Ver. 07.00.1012 and earlier, PR-500KI/RT-500KI firmware version Ver.01.00.0090 and earlier, and PR-500MI/RT-500MI firmware version Ver.01.01.0011 and earlier) allow remote attackers to inject arbitrary web script or HTML via unspecified vectors. Affected products include: Ntt-East Pr-S300Ne Firmware, Ntt-East Rt-S300Ne Firmware, Ntt-East Rv-S340Ne Firmware, Ntt-East Pr-S300Hi Firmware, Ntt-East Rt-S300Hi Firmware.

Severity by source

NVD PRIMARY 6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionNVD

Cross-site scripting vulnerability in Hikari Denwa router/Home GateWay (Hikari Denwa router/Home GateWay provided by NIPPON TELEGRAPH AND TELEPHONE EAST CORPORATION PR-S300NE/RT-S300NE/RV-S340NE firmware version Ver. 19.41 and earlier, PR-S300HI/RT-S300HI/RV-S340HI firmware version Ver.19.01.0005 and earlier, PR-S300SE/RT-S300SE/RV-S340SE firmware version Ver.19.40 and earlier, PR-400NE/RT-400NE/RV-440NE firmware version Ver.7.42 and earlier, PR-400KI/RT-400KI/RV-440KI firmware version Ver.07.00.1010 and earlier, PR-400MI/RT-400MI/RV-440MI firmware version Ver. 07.00.1012 and earlier, PR-500KI/RT-500KI firmware version Ver.01.00.0090 and earlier, RS-500KI firmware version Ver.01.00.0070 and earlier, PR-500MI/RT-500MI firmware version Ver.01.01.0014 and earlier, and RS-500MI firmware version Ver.03.01.0019 and earlier, and Hikari Denwa router/Home GateWay provided by NIPPON TELEGRAPH AND TELEPHONE WEST CORPORATION PR-S300NE/RT-S300NE/RV-S340NE firmware version Ver. 19.41 and earlier, PR-S300HI/RT-S300HI/RV-S340HI firmware version Ver.19.01.0005 and earlier, PR-S300SE/RT-S300SE/RV-S340SE firmware version Ver.19.40 and earlier, PR-400NE/RT-400NE/RV-440NE firmware version Ver.7.42 and earlier, PR-400KI/RT-400KI/RV-440KI firmware version Ver.07.00.1010 and earlier, PR-400MI/RT-400MI/RV-440MI firmware version Ver. 07.00.1012 and earlier, PR-500KI/RT-500KI firmware version Ver.01.00.0090 and earlier, and PR-500MI/RT-500MI firmware version Ver.01.01.0011 and earlier) allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Threat Intelligence Overview

EPSS Score
0.9%
Top 45% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.9%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

31
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)NVD

cpe:2.3:o:ntt-east:pr-s300ne_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-s300ne_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rv-s340ne_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:pr-s300hi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-s300hi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rv-s340hi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:pr-s300se_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-s300se_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rv-s340se_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:pr-400ne_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-400ne_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rv-440ne_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:pr-400ki_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-400ki_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rv-440ki_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:pr-400mi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-400mi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rv-440mi_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:pr-500ki_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ntt-east:rt-500ki_firmware:*:*:*:*:*:*:*:*
+ 26 more

More in Rt 400Mi Firmware

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CVE-2016-1228 HIGH
8.8 Jul 03

Cross-site request forgery (CSRF) vulnerability on NTT EAST Hikari Denwa routers with firmware PR-400MI, RT-400MI, and R
CVE-2019-5986 HIGH
8.8 Sep 12

Cross-site request forgery (CSRF) vulnerability in Hikari Denwa router/Home GateWay (Hikari Denwa router/Home GateWay pr
CVE-2016-1227 HIGH
7.2 Jul 03

NTT EAST Hikari Denwa routers with firmware PR-400MI, RT-400MI, and RV-440MI 07.00.1006 and earlier and NTT WEST Hikari

Same weakness CWE-79 – Cross-site Scripting (XSS)

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CVE-2014-2120 MEDIUM
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CVE-2023-40000 HIGH POC
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CVE-2016-8581 MEDIUM POC
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CVE-2025-52367 MEDIUM POC
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CVE-2017-9248 CRITICAL POC
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References

Advisories & patches
ADVISORY https://www.ntt-west.co.jp/kiki/support/flets/hgw/190626.html REF http://jvn.jp/en/jp/JVN43172719/index.html

Search Externally

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