CVE-2021-38476Network attack vector

Account enumeration via distinguishable authentication responses

Published Oct 19, 2021 · Updated Sep 16, 2024

Observable response discrepancy in InHand Networks InRouter615-S 2.3.0.r4724 and 2.3.0.r4870 allows remote attackers to enumerate user accounts. The web authentication process returns distinguishable responses that reveal whether a submitted username exists. No authentication or user interaction is required; disclosed account names can support targeted credential attacks.

CVSS severity6.5
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable response discrepancy in InHand Networks InRouter615-S 2.3.0.r4724 and 2.3.0.r4870 allows remote attackers to enumerate user accounts. The web authentication process returns distinguishable responses that reveal whether a submitted username exists. No authentication or user interaction is required; disclosed account names can support targeted credential attacks.

The record

CVE
CVE-2021-38476
Published
Oct 19, 2021
Updated
Sep 16, 2024
Vendor
InHand Networks
Product
InRouter615-S
Classifications
CWE-204, CWE-203, T1589.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=2.3.0.r4724 and 2.3.0.r4870

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

InHand Networks · InRouter615-Sversion=2.3.0.r4724 and 2.3.0.r4870

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
6.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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-204Observable Response Discrepancy
CWE-203Observable Discrepancy
T1589.001Gather Victim Identity Information: Credentials

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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