# CVE-2015-0640: Denial of service in n/a

> Remote attackers can cause a device reload via large fragmented IP packets requiring NAT and HSL processing in Cisco IOS XE.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Mar 2015
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-ghv2-r6gc-95rm

## What is CVE-2015-0640?

CVE-2015-0640 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 26 Mar 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The high-speed logging (HSL) feature in Cisco IOS XE 2.x and 3.x before 3.10.4S, 3.11 before 3.11.3S, 3.12 before 3.12.1S, 3.13 before 3.13.0S, 3.14 before 3.14.0S, and 3.15 before 3.15.0S allows remote attackers to cause a denial of service (device reload) via large IP packets that require NAT and HSL processing after fragmentation, aka Bug ID CSCuo25741.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2015-0640?

It affects 1 product.


Products: Cisco Ios Xe.

## How do I fix CVE-2015-0640?

No fix has been published for CVE-2015-0640 yet. Limit exposure of the affected software until one is available.

## Is CVE-2015-0640 being exploited?

There is no known exploitation of CVE-2015-0640 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios Xe

- [CVE-2023-20198](https://insights.sbomify.com/CVE-2023-20198/): Cisco IOS XE Web UI Privilege Escalation (critical 10.0, exploited in the wild)
- [CVE-2018-0151](https://insights.sbomify.com/CVE-2018-0151/): Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2023-20273](https://insights.sbomify.com/CVE-2023-20273/): Cisco IOS XE Web UI Command Injection (high 7.2, exploited in the wild)
- [CVE-2025-20188](https://insights.sbomify.com/CVE-2025-20188/): Hardcoded credentials in Cisco IOS XE Software (critical 10.0)
- [CVE-2021-34770](https://insights.sbomify.com/CVE-2021-34770/): Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-0640 and fix it if it is affected.

What it is: CVE-2015-0640 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 26 Mar 2015. 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-2015-0640 in the wild and no public exploit code.

Affected product: Cisco Ios Xe. 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-2015-0640/ (Markdown: https://insights.sbomify.com/CVE-2015-0640/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-0640
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-0640
- OSV: https://osv.dev/vulnerability/CVE-2015-0640

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-0640/
Summaries are generated and may contain mistakes; the official description above is the record.