# CVE-2017-12355: Denial of service in Cisco IOS XR

> Unauthenticated remote attackers can cause a brief denial of service in Cisco IOS XR by sending crafted XML requests to the management interface.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Nov 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-x59f-6gm6-9rr3

## What is CVE-2017-12355?

CVE-2017-12355 is a medium-severity denial of service vulnerability in Cisco Ios Xr, published on 30 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Local Packet Transport Services (LPTS) ingress frame-processing functionality of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause one of the LPTS processes on an affected system to restart unexpectedly, resulting in a brief denial of service (DoS) condition. The vulnerability is due to incomplete LPTS frame validation by the affected software. An attacker could exploit this vulnerability by sending crafted XML requests to the management interface of an affected system. A successful exploit could allow the attacker to cause one of the LPTS processes on the affected system to restart unexpectedly, which would impact LPTS traffic and cause a brief DoS condition while the process restarts. Cisco Bug IDs: CSCvf76332.

Weakness: CWE-20 (Improper Input Validation), CWE-399

## Which versions are affected by CVE-2017-12355?

It affects 1 product.


Products: Cisco Ios Xr.

## How do I fix CVE-2017-12355?

No fix has been published for CVE-2017-12355 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-12355 being exploited?

There is no known exploitation of CVE-2017-12355 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios Xr

- [CVE-2020-3118](https://insights.sbomify.com/CVE-2020-3118/): Cisco IOS XR Software Discovery Protocol Format String (high 8.8, exploited in the wild)
- [CVE-2020-3569](https://insights.sbomify.com/CVE-2020-3569/): Cisco IOS XR Software DVMRP Memory Exhaustion (high 8.6, exploited in the wild)
- [CVE-2020-3566](https://insights.sbomify.com/CVE-2020-3566/): Cisco IOS XR Software DVMRP Memory Exhaustion (high 8.6, exploited in the wild)
- [CVE-2010-3035](https://insights.sbomify.com/CVE-2010-3035/): Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service (high 7.5, exploited in the wild)
- [CVE-2022-20821](https://insights.sbomify.com/CVE-2022-20821/): Cisco IOS XR Open Port (medium 6.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-12355 and fix it if it is affected.

What it is: CVE-2017-12355 is a medium-severity denial of service vulnerability in Cisco Ios Xr, published on 30 Nov 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-2017-12355 in the wild and no public exploit code.

Affected product: Cisco Ios Xr. 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-2017-12355/ (Markdown: https://insights.sbomify.com/CVE-2017-12355/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-12355
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-12355
- OSV: https://osv.dev/vulnerability/CVE-2017-12355

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-12355/
Summaries are generated and may contain mistakes; the official description above is the record.