# CVE-2021-2371: Denial of service in Coherence

> Unauthenticated attackers can cause a complete denial of service in Oracle Coherence via network access.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 20 Jul 2021
- **Updated:** 26 Sep 2024
- **Also known as:** GHSA-r2p9-7wp8-88mg

## What is CVE-2021-2371?

CVE-2021-2371 is a high-severity denial of service vulnerability in Oracle Coherence, published on 20 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 3.7.1.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0 and 14.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle Coherence. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Coherence. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

## Which versions are affected by CVE-2021-2371?

It affects 1 product.


Products: Oracle Coherence.

## How do I fix CVE-2021-2371?

No fix has been published for CVE-2021-2371 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-2371 being exploited?

There is no known exploitation of CVE-2021-2371 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Coherence

- [CVE-2026-60217](https://insights.sbomify.com/CVE-2026-60217/): Auth bypass in Oracle Coherence (critical 10.0)
- [CVE-2026-35307](https://insights.sbomify.com/CVE-2026-35307/): Auth bypass in Oracle Coherence (critical 10.0)
- [CVE-2026-35308](https://insights.sbomify.com/CVE-2026-35308/): Auth bypass in Oracle Coherence (critical 10.0)
- [CVE-2026-60197](https://insights.sbomify.com/CVE-2026-60197/): Auth bypass in Oracle Coherence (critical 9.8)
- [CVE-2026-60209](https://insights.sbomify.com/CVE-2026-60209/): Auth bypass in Oracle Coherence (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-2371 and fix it if it is affected.

What it is: CVE-2021-2371 is a high-severity denial of service vulnerability in Oracle Coherence, published on 20 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-2021-2371 in the wild and no public exploit code.

Affected product: Oracle Coherence. 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-2021-2371/ (Markdown: https://insights.sbomify.com/CVE-2021-2371/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-2371
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-2371
- OSV: https://osv.dev/vulnerability/CVE-2021-2371

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-2371/
Summaries are generated and may contain mistakes; the official description above is the record.