# CVE-2020-10123: Auth bypass in SelfServ ATM

> Attackers with physical access can bypass authentication to dispense cash from NCR SelfServ ATMs by generating valid session keys.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Aug 2020
- **Updated:** 4 Nov 2025
- **Also known as:** GHSA-9fqf-7qjx-9m2h

## What is CVE-2020-10123?

CVE-2020-10123 is a medium-severity authentication bypass vulnerability in NCR SelfServ ATM, published on 21 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The currency dispenser of NCR SelfSev ATMs running APTRA XFS 05.01.00 or earlier does not adequately authenticate session key generation requests from the host computer, allowing an attacker with physical access to internal ATM components to issue valid commands to dispense currency by generating a new session key that the attacker knows.

Weakness: CWE-287 (Improper Authentication), CWE-305 (Authentication Bypass by Primary Weakness)

## Which versions are affected by CVE-2020-10123?

It affects 1 product.


Products: Ncr Aptra Xfs.

## How do I fix CVE-2020-10123?

No fix has been published for CVE-2020-10123 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-10123 being exploited?

There is no known exploitation of CVE-2020-10123 in the wild and no public exploit code.

## Other vulnerabilities in NCR SelfServ ATM

- [CVE-2020-10125](https://insights.sbomify.com/CVE-2020-10125/): Weak cryptography in SelfServ ATM (high 7.6)
- [CVE-2020-10126](https://insights.sbomify.com/CVE-2020-10126/): Code injection in SelfServ ATM (high 7.6)
- [CVE-2020-9063](https://insights.sbomify.com/CVE-2020-9063/): Memory corruption in SelfServ ATM (high 7.6)
- [CVE-2020-10124](https://insights.sbomify.com/CVE-2020-10124/): Missing authorization in SelfServ ATM (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-10123 and fix it if it is affected.

What it is: CVE-2020-10123 is a medium-severity authentication bypass vulnerability in NCR SelfServ ATM, published on 21 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-10123 in the wild and no public exploit code.

Affected product: NCR SelfServ ATM. 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-2020-10123/ (Markdown: https://insights.sbomify.com/CVE-2020-10123/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10123
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10123
- OSV: https://osv.dev/vulnerability/CVE-2020-10123

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-10123/
Summaries are generated and may contain mistakes; the official description above is the record.