No exploitation reportedFix available

CVE-2021-22779

Q: Is CVE-2021-22779 actively exploited?

Active exploitation of CVE-2021-22779 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-22779?

CVE-2021-22779 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

No exploitation reported by the sources we read.

Published2021-07-14
Fixed in15.0
WeaknessCWE-290

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Authentication Bypass by Spoofing vulnerability exists in EcoStruxure Control Expert (all versions prior to V15.0 SP1, including all versions of Unity Pro), EcoStruxure Control Expert V15.0 SP1, EcoStruxure Process Expert (all versions, including all versions of EcoStruxure Hybrid DCS), SCADAPack RemoteConnect for x70 (all versions), Modicon M580 CPU (all versions - part numbers BMEP* and BMEH*), Modicon M340 CPU (all versions - part numbers BMXP34*), that could cause unauthorized access in read and write mode to the controller by spoofing the Modbus communication between the engineering software and the controller.

Timeline

dates in UTC

2021-07-1415:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-22779?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-22779?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Schneider-electric ecostruxure control expert

Branch	Affected	Fixed in	Source
15.0	< 15.0	15.0	NVD
15.0	= 15.0	no fix published	NVD

Schneider-electric ecostruxure process expert

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Schneider-electric modicon m340 bmxp341000 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

29 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-194-02 CISA6 known affected
Schneider Electric Modicon Controllers and Software (Update A)
EcoStruxure Process Expert: all versions Including all versions of EcoStruxure Hybrid DCS (former name of EcoStruxure Process Expert) · EcoStruxure Control Expert: v15.0 SP1 · Modicon M340 CPU (part numbers BMXP34*): all versions · +3 more

Full record on NVD

Fix

Update Schneider-electric ecostruxure control expert to 15.0
Mitigation from the vendor CISA ICSA-21-194-02 · 6 productsSchneider Electric provides detailed mitigation information for each of the affected products in their own advisory, for more information about these issues, please refer to the original Schneider Electric publication SEVD-2021-194-01.

Advisories and patches

download.schneider-electric.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-05-29
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.16.52026-05-29
NVDCVSS 3.19.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
CNAweakness (CWE)CWE-290read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2021-07-14
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-22779?

Is CVE-2021-22779 actively exploited?

Active exploitation of CVE-2021-22779 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-22779?

CVE-2021-22779 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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