No exploitation reportedFix available

CVE-2021-22764

Q: Is CVE-2021-22764 actively exploited?

Active exploitation of CVE-2021-22764 has not been confirmed. Its EPSS score was 1.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-22764?

CVE-2021-22764 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

No exploitation reported by the sources we read.

Published2021-06-11
Fixed in2.7.8
WeaknessCWE-287

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

A CWE-287: Improper Authentication vulnerability exists in PowerLogic PM55xx, PowerLogic PM8ECC, PowerLogic EGX100 and PowerLogic EGX300 (see security notification for version infromation) that could cause loss of connectivity to the device via Modbus TCP protocol when an attacker sends a specially crafted HTTP request.

Timeline

dates in UTC

2021-06-1116:15CVE 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-2021-22764?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-22764?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 powerlogic pm5560 firmwareversion to verify

Branch	Affected	Fixed in	Source
2.7	< 2.7.8	2.7.8	NVD

Schneider-electric powerlogic pm5561 firmwareversion to verify

Branch	Affected	Fixed in	Source
10.7	< 10.7.3	10.7.3	NVD

Schneider-electric powerlogic pm5562 firmwareversion to verify

Branch	Affected	Fixed in	Source
2.5	≤ 2.5.4	no fix published	NVD

1 more product 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-24-331-01 CISA4 products fixed · 4 known affected
Schneider Electric PowerLogic PM55xx and PowerLogic PM8ECC
Schneider Electric PowerLogic PM5560 Versions prior to v2.7.8 · Schneider Electric PowerLogic PM5561 Versions prior to v10.7.3 · Schneider Electric PowerLogic PM5562 v2.5.4 and prior · +1 more

Full record on NVD

Fix

Update Schneider-electric powerlogic pm5560 firmware to 2.7.8
Vendor fix CISA ICSA-24-331-01 · 2 productsVersion 2.8.3 of the PowerLogic PM5560, 5563, 5580 firmware includes fixes for these vulnerabilities. The version update files are available for download here: https://www.se.com/ww/en/product-range/61281-powerlogicpm5000-power-meters/?parent-subcategoryid=4125&filter=business-2-building-automat…
Vendor fix CISA ICSA-24-331-01 · 1 productVersion 10.7.3 of the PowerLogic PM5561 firmware includes fixes for these vulnerabilities. The version update files are available for download here: https://www.se.com/ww/en/product-range/61281-powerlogicpm5000-power-meters/?parent-subcategoryid=4125&filter=business-2-building-automation-andcont…
Vendor fix CISA ICSA-24-331-01 · 1 productVersion 4.3.5 of the PowerLogic PM5562 firmware includes fixes for these vulnerabilities. The version update files are available for download here: https://www.se.com/ww/en/product-range/61281-powerlogicpm5000/12146169702-basic-multifunction-metering/?selectednode-id=12146169702&N=brand=se%26cou…
Vendor fix CISA ICSA-24-331-01 · 1 productPowerLogic PM8ECC has reached end of service and is no longer supported. Customers should immediately apply the following mitigation to reduce the risk of exploit: Customers should consider blocking HTTP access to the device at the firewall level once commissioning is complete to reduce the ri…

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 3.15.32026-05-29
NVDCVSS 3.15.3read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score1.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: 2021-06-11
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-22764?

Is CVE-2021-22764 actively exploited?

Active exploitation of CVE-2021-22764 has not been confirmed. Its EPSS score was 1.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-22764?

CVE-2021-22764 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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