CVE-2021-22766Network attack vector

Unauthenticated service interruption via crafted HTTP packet

Published Jun 11, 2021 · Updated May 29, 2026

Improper input validation in PowerLogic EGX100 3.0.0 and newer and all EGX300 versions allows remote attackers to interrupt service via HTTP. Schneider Electric has not disclosed the affected HTTP handler, malformed field, or incorrect validation operation. No authentication or user interaction is required; a crafted packet can disrupt gateway availability, but no confidentiality or integrity impact is reported.

CVSS severity7.5
High
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in PowerLogic EGX100 3.0.0 and newer and all EGX300 versions allows remote attackers to interrupt service via HTTP. Schneider Electric has not disclosed the affected HTTP handler, malformed field, or incorrect validation operation. No authentication or user interaction is required; a crafted packet can disrupt gateway availability, but no confidentiality or integrity impact is reported.

The record

CVE
CVE-2021-22766
Published
Jun 11, 2021
Updated
May 29, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2021CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

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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