# CVE-2020-35510: Uncontrolled Resource Consumption in jboss-remoting

> An attacker can cause a denial of service in JBoss EJB servers by withholding ACK messages, leading to thread exhaustion and system unavailability.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/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:** Yes
- **Published:** 2 Jun 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-p6j8-hgv5-m35g

## What is CVE-2020-35510?

CVE-2020-35510 is a medium-severity denial of service vulnerability in jboss-remoting, published on 2 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in jboss-remoting in versions before 5.0.20.SP1-redhat-00001. A malicious attacker could cause threads to hold up forever in the EJB server by writing a sequence of bytes corresponding to the expected messages of a successful EJB client request, but omitting the ACK messages, or just tamper with jboss-remoting code, deleting the lines that send the ACK message from the EJB client code resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2020-35510?

2 open source packages ship an affected version, including org.jboss.remoting:jboss-remoting. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.jboss.remoting:jboss-remoting` | Maven | All versions | 5.0.20.Final |
| `org.jboss.remoting:jboss-remoting` | Maven | All versions | 5.0.20.Final |

Products: Redhat Jboss-Remoting.

## How do I fix CVE-2020-35510?

Upgrade org.jboss.remoting:jboss-remoting to 5.0.20.Final or later.

## Is CVE-2020-35510 being exploited?

There is no known exploitation of CVE-2020-35510 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35510 and fix it if it is affected.

What it is: CVE-2020-35510 is a medium-severity denial of service vulnerability in jboss-remoting, published on 2 Jun 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-2020-35510 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.jboss.remoting:jboss-remoting (Maven): affected all versions; fixed in 5.0.20.Final
- org.jboss.remoting:jboss-remoting (Maven): affected all versions; fixed in 5.0.20.Final

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-2020-35510/ (Markdown: https://insights.sbomify.com/CVE-2020-35510/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35510
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35510
- OSV: https://osv.dev/vulnerability/CVE-2020-35510

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35510/
Summaries are generated and may contain mistakes; the official description above is the record.