# CVE-2021-1513: Cisco SD-WAN Software vDaemon Denial of Service Vulnerability

> Unauthenticated remote attackers can cause Cisco SD-WAN devices to reload via malformed packets, resulting in a denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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:** 6 May 2021
- **Updated:** 8 Nov 2024
- **Also known as:** GHSA-g2x9-h986-5hj3

## What is CVE-2021-1513?

CVE-2021-1513 is a high-severity denial of service vulnerability in Cisco Catalyst Sd-Wan Manager, published on 6 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the vDaemon process of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to cause a device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient handling of malformed packets. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-1513?

It affects 12 products.


Products: Cisco Catalyst Sd-Wan Manager, Cisco Sd-Wan Vbond Orchestrator, Cisco Vedge-100b Firmware, Cisco Vedge 1000 Firmware, Cisco Vedge 100 Firmware, Cisco Vedge 100b Firmware, Cisco Vedge 100m Firmware, Cisco Vedge 100wm Firmware, Cisco Vedge 2000 Firmware, Cisco Vedge 5000 Firmware, Cisco Vedge Cloud Firmware, Cisco Vsmart Controller Firmware.

## How do I fix CVE-2021-1513?

No fix has been published for CVE-2021-1513 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1513 being exploited?

There is no known exploitation of CVE-2021-1513 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Catalyst Sd-Wan Manager

- [CVE-2026-20182](https://insights.sbomify.com/CVE-2026-20182/): Cisco Catalyst SD-WAN Controller Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2026-20127](https://insights.sbomify.com/CVE-2026-20127/): Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2026-76504](https://insights.sbomify.com/CVE-2026-76504/): Cisco Catalyst SD-WAN Manager Hex Encoding (critical 9.8, exploited in the wild)
- [CVE-2026-20245](https://insights.sbomify.com/CVE-2026-20245/): Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output (high 7.8, exploited in the wild)
- [CVE-2022-20775](https://insights.sbomify.com/CVE-2022-20775/): Cisco SD-WAN Path Traversal (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1513 and fix it if it is affected.

What it is: CVE-2021-1513 is a high-severity denial of service vulnerability in Cisco Catalyst Sd-Wan Manager, published on 6 May 2021. 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-2021-1513 in the wild and no public exploit code.

Affected product: Cisco Catalyst Sd-Wan Manager. 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-2021-1513/ (Markdown: https://insights.sbomify.com/CVE-2021-1513/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1513
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1513
- OSV: https://osv.dev/vulnerability/CVE-2021-1513

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-1513/
Summaries are generated and may contain mistakes; the official description above is the record.