# CVE-2021-22764: Auth bypass in PowerLogic PM55xx, PowerLogic EGX100, and PowerLogic EGX300 (see security notification for version infromation)

> An attacker can cause loss of connectivity to PowerLogic devices by sending a specially crafted HTTP request due to improper authentication.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jun 2021
- **Updated:** 29 May 2026
- **Also known as:** GHSA-57rv-qg24-x8hj

## What is CVE-2021-22764?

CVE-2021-22764 is a medium-severity authentication bypass vulnerability in PowerLogic PM55xx, PowerLogic EGX100, and PowerLogic EGX300 (see security notification for version infromation), published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2021-22764?

It affects 4 products.


Products: Schneider-Electric Powerlogic Pm5560 Firmware, Schneider-Electric Powerlogic Pm5561 Firmware, Schneider-Electric Powerlogic Pm5562 Firmware, Schneider-Electric Powerlogic Pm5563 Firmware.

## How do I fix CVE-2021-22764?

No fix has been published for CVE-2021-22764 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22764 being exploited?

There is no known exploitation of CVE-2021-22764 in the wild and no public exploit code.

## Other vulnerabilities in PowerLogic PM55xx, PowerLogic EGX100, and PowerLogic EGX300 (see security notification for version infromation)

- [CVE-2021-22763](https://insights.sbomify.com/CVE-2021-22763/): Auth bypass in PowerLogic PM55xx, PowerLogic PM8ECC, PowerLogic EGX100 and PowerLogic EGX300 (see security notification for version infromation) (critical 9.8)
- [CVE-2018-7795](https://insights.sbomify.com/CVE-2018-7795/): Cross-site scripting in PowerLogic - PM5560 prior to FW version 2.5.4 (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22764 and fix it if it is affected.

What it is: CVE-2021-22764 is a medium-severity authentication bypass vulnerability in PowerLogic PM55xx, PowerLogic EGX100, and PowerLogic EGX300 (see security notification for version infromation), published on 11 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-22764 in the wild and no public exploit code.

Affected product: PowerLogic PM55xx, PowerLogic EGX100, and PowerLogic EGX300 (see security notification for version infromation). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-22764/ (Markdown: https://insights.sbomify.com/CVE-2021-22764/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22764
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22764
- OSV: https://osv.dev/vulnerability/CVE-2021-22764

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-22764/
Summaries are generated and may contain mistakes; the official description above is the record.