# CVE-2004-1464: Cisco IOS Denial-of-Service

> Remote attackers can cause a denial of service by refusing VTY connections via crafted TCP traffic to Telnet ports on Cisco IOS devices.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Yes, since 19 May 2023 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Feb 2005
- **Updated:** 22 Oct 2025
- **Also known as:** GHSA-7757-mj68-c29v

## What is CVE-2004-1464?

CVE-2004-1464 is a medium-severity denial of service vulnerability in Cisco Ios, published on 13 Feb 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2004-1464?

It affects 1 product.


Products: Cisco Ios.

## How do I fix CVE-2004-1464?

No fix has been published for CVE-2004-1464 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 9 Jun 2023.

## Is CVE-2004-1464 being exploited?

Yes. Attackers have exploited CVE-2004-1464 in the wild since at least 19 May 2023.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2004-1464 and fix it if it is affected.

What it is: CVE-2004-1464 is a medium-severity denial of service vulnerability in Cisco Ios, published on 13 Feb 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2004-1464 in the wild since at least 19 May 2023.

Affected product: Cisco Ios. 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-2004-1464/ (Markdown: https://insights.sbomify.com/CVE-2004-1464/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-1464
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-1464
- OSV: https://osv.dev/vulnerability/CVE-2004-1464

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From sbomify Insights: https://insights.sbomify.com/CVE-2004-1464/
Summaries are generated and may contain mistakes; the official description above is the record.