# CVE-2015-7705: Denial of service in n/a

> Remote attackers can cause denial of service in NTP servers by sending a large number of crafted requests, bypassing rate limiting mechanisms.

- **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:** Yes
- **Published:** 7 Aug 2017
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-7705, GHSA-xj8r-mpwc-m649, UBUNTU-CVE-2015-7705

## What is CVE-2015-7705?

CVE-2015-7705 is a critical denial of service vulnerability in Citrix Xenserver, published on 7 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of crafted requests.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2015-7705?

It affects 8 products.


Products: Citrix Xenserver, Netapp Clustered Data Ontap, Netapp Data Ontap, Netapp Oncommand Performance Manager, Netapp Oncommand Unified Manager, Ntp Ntp, Siemens Tim 4r-Ie Dnp3 Firmware, Siemens Tim 4r-Ie Firmware.

## How do I fix CVE-2015-7705?

Upgrade to a fixed version.

## Is CVE-2015-7705 being exploited?

There is no known exploitation of CVE-2015-7705 in the wild and no public exploit code.

## Other vulnerabilities in Citrix Xenserver

- [CVE-2014-4947](https://insights.sbomify.com/CVE-2014-4947/): Memory corruption in n/a (critical 10.0)
- [CVE-2018-14007](https://insights.sbomify.com/CVE-2018-14007/): Path traversal in n/a (critical 9.8)
- [CVE-2016-5302](https://insights.sbomify.com/CVE-2016-5302/): Auth bypass in n/a (critical 9.8)
- [CVE-2017-12134](https://insights.sbomify.com/CVE-2017-12134/): Memory corruption in n/a (high 8.8)
- [CVE-2017-12135](https://insights.sbomify.com/CVE-2017-12135/): Privilege escalation in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-7705 and fix it if it is affected.

What it is: CVE-2015-7705 is a critical denial of service vulnerability in Citrix Xenserver, published on 7 Aug 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-2015-7705 in the wild and no public exploit code.

Affected product: Citrix Xenserver. 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-2015-7705/ (Markdown: https://insights.sbomify.com/CVE-2015-7705/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7705
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7705
- OSV: https://osv.dev/vulnerability/CVE-2015-7705

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-7705/
Summaries are generated and may contain mistakes; the official description above is the record.