CVE-2021-42536Network attack vector

Authenticated peer credential disclosure via global variables

Published Oct 22, 2021 · Updated Sep 17, 2024

Information disclosure in Emerson WirelessHART Gateway before 4.7.94 allows remote authenticated users to read peer credentials. The gateway exposes global variables containing peer usernames and passwords to every user instead of enforcing per-user authorization. Exploitation requires a low-privileged authenticated session and user interaction; the documented behavior discloses credentials.

CVSS severity8.0
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Emerson WirelessHART Gateway before 4.7.94 allows remote authenticated users to read peer credentials. The gateway exposes global variables containing peer usernames and passwords to every user instead of enforcing per-user authorization. Exploitation requires a low-privileged authenticated session and user interaction; the documented behavior discloses credentials.

The record

CVE
CVE-2021-42536
Published
Oct 22, 2021
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0CISACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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.

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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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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