# CVE-2017-17549: Information disclosure in n/a

> Remote attackers can obtain sensitive information from backend TLS handshakes in Citrix NetScaler ADC and Gateway when using Client Certificates with DHE key exchange.

- **Severity:** Medium 5.9 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Dec 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-8gj6-9x8x-c99v

## What is CVE-2017-17549?

CVE-2017-17549 is a medium-severity vulnerability in n/a, published on 13 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2017-17549?

It affects 2 products.


Products: Citrix Application Delivery Controller Firmware, Citrix Netscaler Gateway Firmware.

## How do I fix CVE-2017-17549?

No fix has been published for CVE-2017-17549 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-17549 being exploited?

There is no known exploitation of CVE-2017-17549 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-27518](https://insights.sbomify.com/CVE-2022-27518/): Citrix Application Delivery Controller (ADC) and Gateway Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-19781](https://insights.sbomify.com/CVE-2019-19781/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution (critical 9.8, exploited in the wild)
- [CVE-2020-8193](https://insights.sbomify.com/CVE-2020-8193/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass (medium 6.5, exploited in the wild)
- [CVE-2020-8195](https://insights.sbomify.com/CVE-2020-8195/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure (medium 6.5, exploited in the wild)
- [CVE-2020-8196](https://insights.sbomify.com/CVE-2020-8196/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure (medium 4.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-17549 and fix it if it is affected.

What it is: CVE-2017-17549 is a medium-severity vulnerability in n/a, published on 13 Dec 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-2017-17549 in the wild and no public exploit code.

Affected product: n/a. 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-2017-17549/ (Markdown: https://insights.sbomify.com/CVE-2017-17549/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-17549
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-17549
- OSV: https://osv.dev/vulnerability/CVE-2017-17549

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-17549/
Summaries are generated and may contain mistakes; the official description above is the record.