5.3

CVE-2021-22764: schneider-electric powerlogic_pm5560_firmware Improper Authentication

CVSS: 5.3v3.1MediumModified
Published 11-06-2021Last modified 29-05-2026
Open JSON

Vulnerability summary

CVE-2021-22764 is a medium (CVSS 5.3) Improper Authentication vulnerability in schneider-electric powerlogic_pm5560_firmware. EPSS estimates a 1.87% chance of exploitation in the next 30 days, higher than 79% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.87%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-06-2021
    PublishedVulnerability first disclosed.
  2. 29-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.87%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

0.00 pp

From 1.87% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.87%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Schneider-electric4 products

1 vendor · 4 products

References

2 links