CVE-2021-22781

SMTP credential disclosure via unprotected project-file storage

Published Jul 14, 2021 · Updated Aug 3, 2024

Credential exposure in Schneider Electric engineering software allows attackers with project-file access to read stored SMTP mailbox credentials. Project-file serialization stores the mailbox authentication secret without sufficient protection; Schneider Electric has not published the exact encoding or storage routine. EcoStruxure Control Expert before 15.0 SP1, all Unity Pro versions, EcoStruxure Process Expert before 2021 including Hybrid DCS, and all SCADAPack RemoteConnect for x70 versions are affected; obtaining a project file is required and the disclosed impact is credential exposure only.

CVSS severity6.2
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in Schneider Electric engineering software allows attackers with project-file access to read stored SMTP mailbox credentials. Project-file serialization stores the mailbox authentication secret without sufficient protection; Schneider Electric has not published the exact encoding or storage routine. EcoStruxure Control Expert before 15.0 SP1, all Unity Pro versions, EcoStruxure Process Expert before 2021 including Hybrid DCS, and all SCADAPack RemoteConnect for x70 versions are affected; obtaining a project file is required and the disclosed impact is credential exposure only.

The record

CVE
CVE-2021-22781
Published
Jul 14, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-522, T1552.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.2Schneider ElectricCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1552.001Credentials In Files

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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