# CVE-2020-1621: Junos OS Evolved: Configd leaks hashes via stream and is world readable

> A local authenticated user can read hashed login passwords from world-readable configd traces, exposing sensitive credentials.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-cwf2-c942-3pqv

## What is CVE-2020-1621?

CVE-2020-1621 is a medium-severity vulnerability in Juniper Junos Os Evolved, published on 8 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A local, authenticated user with shell can obtain the hashed values of login passwords via configd traces. This issue affects all versions of Junos OS Evolved prior to 19.3R1.

Weakness: CWE-532 (Insertion of Sensitive Information into Log File), CWE-664 (Improper Control of a Resource Through its Lifetime)

## Which versions are affected by CVE-2020-1621?

It affects 1 product.


Products: Juniper Junos Os Evolved.

## How do I fix CVE-2020-1621?

No fix has been published for CVE-2020-1621 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-1621 being exploited?

There is no known exploitation of CVE-2020-1621 in the wild and no public exploit code.

## Other vulnerabilities in Juniper Junos Os Evolved

- [CVE-2026-21902](https://insights.sbomify.com/CVE-2026-21902/): Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root (critical 9.3)
- [CVE-2023-28983](https://insights.sbomify.com/CVE-2023-28983/): Junos OS Evolved: Shell Injection vulnerability in the gNOI server (high 8.8)
- [CVE-2025-21599](https://insights.sbomify.com/CVE-2025-21599/): Denial of service in Junos OS Evolved (high 8.7)
- [CVE-2024-47502](https://insights.sbomify.com/CVE-2024-47502/): Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS (high 8.7)
- [CVE-2024-39531](https://insights.sbomify.com/CVE-2024-39531/): Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-1621 and fix it if it is affected.

What it is: CVE-2020-1621 is a medium-severity vulnerability in Juniper Junos Os Evolved, published on 8 Apr 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-2020-1621 in the wild and no public exploit code.

Affected product: Juniper Junos Os Evolved. 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-2020-1621/ (Markdown: https://insights.sbomify.com/CVE-2020-1621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-1621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-1621
- OSV: https://osv.dev/vulnerability/CVE-2020-1621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-1621/
Summaries are generated and may contain mistakes; the official description above is the record.