# CVE-2018-0410: Denial of service in AsyncOS Software for Cisco Web Security Appliances

> Unauthenticated remote attackers can exhaust system memory via excessive TCP connections, causing a denial of service on Cisco Web Security Appliances.

- **Severity:** High 8.6 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Aug 2018
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-7vx9-5h56-f698

## What is CVE-2018-0410?

CVE-2018-0410 is a high-severity denial of service vulnerability in Cisco Web Security Appliance, published on 15 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected system. The vulnerability exists because the affected software improperly manages memory resources for TCP connections to a targeted device. An attacker could exploit this vulnerability by establishing a high number of TCP connections to the data interface of an affected device via IPv4 or IPv6. A successful exploit could allow the attacker to exhaust system memory, which could cause the system to stop processing new connections and result in a DoS condition. System recovery may require manual intervention. Cisco Bug IDs: CSCvf36610.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2018-0410?

It affects 1 product.


Products: Cisco Web Security Appliance.

## How do I fix CVE-2018-0410?

No fix has been published for CVE-2018-0410 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0410 being exploited?

There is no known exploitation of CVE-2018-0410 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Web Security Appliance

- [CVE-2015-6298](https://insights.sbomify.com/CVE-2015-6298/): Command injection in n/a (critical 9.0)
- [CVE-2019-1817](https://insights.sbomify.com/CVE-2019-1817/): Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability (high 8.6)
- [CVE-2015-6292](https://insights.sbomify.com/CVE-2015-6292/): Denial of service in n/a (high 7.8)
- [CVE-2015-6293](https://insights.sbomify.com/CVE-2015-6293/): Denial of service in n/a (high 7.8)
- [CVE-2018-0353](https://insights.sbomify.com/CVE-2018-0353/): Security feature bypass in Cisco Web Security Appliance unknown (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0410 and fix it if it is affected.

What it is: CVE-2018-0410 is a high-severity denial of service vulnerability in Cisco Web Security Appliance, published on 15 Aug 2018. 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-2018-0410 in the wild and no public exploit code.

Affected product: Cisco Web Security Appliance. 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-2018-0410/ (Markdown: https://insights.sbomify.com/CVE-2018-0410/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0410
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0410
- OSV: https://osv.dev/vulnerability/CVE-2018-0410

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0410/
Summaries are generated and may contain mistakes; the official description above is the record.