# CVE-2021-0276: Steel-Belted Radius Carrier Edition: Remote code execution vulnerability when EAP Authentication is configured.

> A stack-based buffer overflow in Juniper SBR Carrier allows remote attackers to execute code or cause denial of service when EAP authentication is enabled.

- **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:** 15 Jul 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-rhq8-hg5g-9g9g

## What is CVE-2021-0276?

CVE-2021-0276 is a critical memory corruption vulnerability in Juniper Networks SBR Carrier, published on 15 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A stack-based Buffer Overflow vulnerability in Juniper Networks SBR Carrier with EAP (Extensible Authentication Protocol) authentication configured, allows an attacker sending specific packets causing the radius daemon to crash resulting with a Denial of Service (DoS) or leading to remote code execution (RCE). By continuously sending this specific packets, an attacker can repeatedly crash the radius daemon, causing a sustained Denial of Service (DoS). This issue affects Juniper Networks SBR Carrier: 8.4.1 versions prior to 8.4.1R19; 8.5.0 versions prior to 8.5.0R10; 8.6.0 versions prior to 8.6.0R4.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2021-0276?

It affects 1 product.


Products: Juniper Steel-Belted Radius Carrier.

## How do I fix CVE-2021-0276?

No fix has been published for CVE-2021-0276 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-0276 being exploited?

There is no known exploitation of CVE-2021-0276 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-0276 and fix it if it is affected.

What it is: CVE-2021-0276 is a critical memory corruption vulnerability in Juniper Networks SBR Carrier, published on 15 Jul 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-2021-0276 in the wild and no public exploit code.

Affected product: Juniper Networks SBR Carrier. 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-2021-0276/ (Markdown: https://insights.sbomify.com/CVE-2021-0276/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-0276
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-0276
- OSV: https://osv.dev/vulnerability/CVE-2021-0276

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-0276/
Summaries are generated and may contain mistakes; the official description above is the record.