# CVE-2017-3865: Denial of service in Cisco StarOS for ASR 5000 Series Routers

> Unauthenticated remote attackers can terminate active IPsec VPN tunnels and prevent new connections, causing a denial of service on Cisco ASR 5000 routers.

- **Severity:** Medium 5.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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:** 4 Jul 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-v9jg-22vm-mw6w

## What is CVE-2017-3865?

CVE-2017-3865 is a medium-severity denial of service vulnerability in Cisco StarOS for ASR 5000 Series Routers, published on 4 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the IPsec component of Cisco StarOS for Cisco ASR 5000 Series Routers could allow an unauthenticated, remote attacker to terminate all active IPsec VPN tunnels and prevent new tunnels from establishing, resulting in a denial of service (DoS) condition. Affected Products: ASR 5000 Series Routers, Virtualized Packet Core (VPC) Software. More Information: CSCvc21129. Known Affected Releases: 21.1.0 21.1.M0.65601 21.1.v0. Known Fixed Releases: 21.2.A0.65754 21.1.b0.66164 21.1.V0.66014 21.1.R0.65759 21.1.M0.65749 21.1.0.66030 21.1.0.

## Which versions are affected by CVE-2017-3865?

It affects 1 product.


Products: Cisco Staros.

## How do I fix CVE-2017-3865?

No fix has been published for CVE-2017-3865 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-3865 being exploited?

There is no known exploitation of CVE-2017-3865 in the wild and no public exploit code.

## Other vulnerabilities in Cisco StarOS for ASR 5000 Series Routers

- [CVE-2023-20046](https://insights.sbomify.com/CVE-2023-20046/): Auth bypass in Cisco ASR 5000 Series Software (high 8.8)
- [CVE-2019-1869](https://insights.sbomify.com/CVE-2019-1869/): Cisco StarOS Denial of Service Vulnerability (high 8.6)
- [CVE-2018-0369](https://insights.sbomify.com/CVE-2018-0369/): Denial of service in Cisco StarOS unknown (high 8.6)
- [CVE-2017-6707](https://insights.sbomify.com/CVE-2017-6707/): Command injection in Cisco StarOS (high 8.2)
- [CVE-2021-1539](https://insights.sbomify.com/CVE-2021-1539/): Cisco ASR 5000 Series Software Authorization Bypass Vulnerabilities (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-3865 and fix it if it is affected.

What it is: CVE-2017-3865 is a medium-severity denial of service vulnerability in Cisco StarOS for ASR 5000 Series Routers, published on 4 Jul 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-2017-3865 in the wild and no public exploit code.

Affected product: Cisco StarOS for ASR 5000 Series Routers. 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-2017-3865/ (Markdown: https://insights.sbomify.com/CVE-2017-3865/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3865
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3865
- OSV: https://osv.dev/vulnerability/CVE-2017-3865

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-3865/
Summaries are generated and may contain mistakes; the official description above is the record.