# CVE-2021-22820: Auth bypass in n/a

> Attackers can maintain unauthorized access to EV charging station web servers via hijacked sessions even after password changes.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jan 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-2c5p-55qj-5p58

## What is CVE-2021-22820?

CVE-2021-22820 is a critical authentication bypass vulnerability in n/a, published on 28 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A CWE-614 Insufficient Session Expiration vulnerability exists that could allow an attacker to maintain an unauthorized access over a hijacked session to the charger station web server even after the legitimate user account holder has changed his password. Affected Products: EVlink City EVC1S22P4 / EVC1S7P4 (All versions prior to R8 V3.4.0.2 ), EVlink Parking EVW2 / EVF2 / EVP2PE (All versions prior to R8 V3.4.0.2), and EVlink Smart Wallbox EVB1A (All versions prior to R8 V3.4.0.2)

Weakness: CWE-613 (DEPRECATED: Insufficient Session Expiration)

## Which versions are affected by CVE-2021-22820?

It affects 6 products.


Products: Schneider-Electric Evlink City Evc1s22p4 Firmware, Schneider-Electric Evlink City Evc1s7p4 Firmware, Schneider-Electric Evlink Parking Evf2 Firmware, Schneider-Electric Evlink Parking Evp2pe Firmware, Schneider-Electric Evlink Parking Evw2 Firmware, Schneider-Electric Evlink Smart Wallbox Evb1a Firmware.

## How do I fix CVE-2021-22820?

No fix has been published for CVE-2021-22820 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22820 being exploited?

There is no known exploitation of CVE-2021-22820 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-22707](https://insights.sbomify.com/CVE-2021-22707/): Hardcoded credentials in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) (critical 9.8)
- [CVE-2021-22727](https://insights.sbomify.com/CVE-2021-22727/): Weak cryptography in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) (critical 9.8)
- [CVE-2021-22729](https://insights.sbomify.com/CVE-2021-22729/): Hardcoded credentials in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) (critical 9.8)
- [CVE-2021-22730](https://insights.sbomify.com/CVE-2021-22730/): Hardcoded credentials in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) (critical 9.8)
- [CVE-2021-22821](https://insights.sbomify.com/CVE-2021-22821/): Server-side request forgery in n/a (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22820 and fix it if it is affected.

What it is: CVE-2021-22820 is a critical authentication bypass vulnerability in n/a, published on 28 Jan 2022. 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-2021-22820 in the wild and no public exploit code.

Affected product: n/a. 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-2021-22820/ (Markdown: https://insights.sbomify.com/CVE-2021-22820/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22820
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22820
- OSV: https://osv.dev/vulnerability/CVE-2021-22820

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22820/
Summaries are generated and may contain mistakes; the official description above is the record.