# CVE-2026-0420: Missing TLS certificate validation in NETGEAR's ReadyCloud client app

> Attackers can intercept ReadyCloud traffic via MiTM due to missing TLS validation, compromising confidentiality on affected NETGEAR routers.

- **Severity:** Medium 4.6 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jun 2026
- **Updated:** 11 Jun 2026
- **Also known as:** GHSA-vww4-r7gr-9xvq

## What is CVE-2026-0420?

CVE-2026-0420 is a medium-severity vulnerability in Netgear Rax120 Firmware, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An improper implementation of TLS certificate validation vulnerability found in NETGEAR's ReadyCloud client app which could allow an attacker to perform attacker-in-the-middle (MiTM) style attacks impacting the product's confidentiality. This vulnerability affects the listed NETGEAR models.

Weakness: CWE-325 (Missing Cryptographic Step)

## Which versions are affected by CVE-2026-0420?

It affects 4 products.


Products: Netgear Rax120 Firmware, Netgear Rax35 Firmware, Netgear Rax38 Firmware, Netgear Rax40 Firmware.

## How do I fix CVE-2026-0420?

No fix has been published for CVE-2026-0420 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-0420 being exploited?

There is no known exploitation of CVE-2026-0420 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-0420 and fix it if it is affected.

What it is: CVE-2026-0420 is a medium-severity vulnerability in Netgear Rax120 Firmware, published on 9 Jun 2026. 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-2026-0420 in the wild and no public exploit code.

Affected product: Netgear Rax120 Firmware. 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-2026-0420/ (Markdown: https://insights.sbomify.com/CVE-2026-0420/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-0420
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0420
- OSV: https://osv.dev/vulnerability/CVE-2026-0420

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-0420/
Summaries are generated and may contain mistakes; the official description above is the record.