How severe is CVE-2021-22764?

CVE-2021-22764 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-22764 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22764?

CVE-2021-22764 primarily affects Schneider-electric Powerlogic Pm5560 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-22764?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-22764 published?

CVE-2021-22764 was published on 2021-06-11 and last updated on 2026-06-17.

CVE-2021-22764

CVE-2021-22764 is a medium-severity vulnerability in Schneider-electric Powerlogic Pm5560 Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Schneider-electric Powerlogic Pm5560 Firmware
Published: 2021-06-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-22764?: 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.
How severe is CVE-2021-22764?: CVE-2021-22764 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-22764 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22764?: CVE-2021-22764 primarily affects Schneider-electric Powerlogic Pm5560 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-22764?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-22764 published?: CVE-2021-22764 was published on 2021-06-11 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:schneider-electric:powerlogic_pm5560_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:powerlogic_pm5561_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:powerlogic_pm5562_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:powerlogic_pm5563_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Schneider-electric Powerlogic Pm5560 Firmware

CVE-2021-22763 — Critical (CVSS 9.8): A CWE-640: Weak Password Recovery Mechanism for Forgotten Password vulnerability exists in PowerLogic PM55xx,…
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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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