# CVE-2017-3730: Bad (EC)DHE parameters cause a client crash

> A malicious server can cause a client crash via bad DHE/ECDHE parameters, leading to denial of service in OpenSSL clients.

- **Severity:** High 7.5 (`CVSS:3.0/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:** Yes
- **Published:** 4 May 2017
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2017-3730, GHSA-rq64-8m54-26j4

## What is CVE-2017-3730?

CVE-2017-3730 is a high-severity vulnerability in Openssl Openssl, published on 4 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In OpenSSL 1.1.0 before 1.1.0d, if a malicious server supplies bad parameters for a DHE or ECDHE key exchange then this can result in the client attempting to dereference a NULL pointer leading to a client crash. This could be exploited in a Denial of Service attack.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2017-3730?

It affects 7 products.


Products: Openssl Openssl, Oracle Agile Engineering Data Management, Oracle Communications Application Session Controller, Oracle Communications Eagle Lnp Application Processor, Oracle Communications Operations Monitor, Oracle Jd Edwards Enterpriseone Tools, Oracle Jd Edwards World Security.

## How do I fix CVE-2017-3730?

Upgrade to a fixed version.

## Is CVE-2017-3730 being exploited?

There is no known exploitation of CVE-2017-3730 in the wild and no public exploit code.

Public exploit code:

- OpenSSL 1.1.0 - Remote Client Denial of Service (exploitdb)
- OpenSSL CVE-2017-3730 proof-of-concept (github_poc): https://github.com/HavocParasite/CVE-2017-3730

## Other vulnerabilities in Openssl Openssl

- [CVE-2009-3245](https://insights.sbomify.com/CVE-2009-3245/): Null dereference in n/a (critical 10.0)
- [CVE-2006-3738](https://insights.sbomify.com/CVE-2006-3738/): Memory corruption in n/a (critical 10.0)
- [CVE-2026-63073](https://insights.sbomify.com/CVE-2026-63073/): Untrusted Sender DN Used as Format String in CMP Response Validation (critical 9.8)
- [CVE-2016-6309](https://insights.sbomify.com/CVE-2016-6309/): Use after free in n/a (critical 9.8)
- [CVE-2016-0799](https://insights.sbomify.com/CVE-2016-0799/): Integer overflow in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-3730 and fix it if it is affected.

What it is: CVE-2017-3730 is a high-severity vulnerability in Openssl Openssl, published on 4 May 2017. 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-2017-3730 in the wild and no public exploit code.

Affected product: Openssl Openssl. 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-2017-3730/ (Markdown: https://insights.sbomify.com/CVE-2017-3730/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3730
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3730
- OSV: https://osv.dev/vulnerability/CVE-2017-3730

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-3730/
Summaries are generated and may contain mistakes; the official description above is the record.