# CVE-2023-20262: Denial of service in Cisco SD-WAN Solution

> Unauthenticated remote attackers can crash the SSH service on Cisco Catalyst SD-WAN Manager, causing a denial of service for SSH access only.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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:** 27 Sep 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-h2rg-8hq7-x2qc

## What is CVE-2023-20262?

CVE-2023-20262 is a medium-severity denial of service vulnerability in Cisco Catalyst Sd-Wan Manager, published on 27 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the SSH service of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to cause a process crash, resulting in a DoS condition for SSH access only. This vulnerability does not prevent the system from continuing to function, and web UI access is not affected.

 This vulnerability is due to insufficient resource management when an affected system is in an error condition. An attacker could exploit this vulnerability by sending malicious traffic to the affected system. A successful exploit could allow the attacker to cause the SSH process to crash and restart, resulting in a DoS condition for the SSH service.

Weakness: CWE-399

## Which versions are affected by CVE-2023-20262?

It affects 2 products.


Products: Cisco Catalyst Sd-Wan Manager, Cisco Sd-Wan Vmanage.

## How do I fix CVE-2023-20262?

No fix has been published for CVE-2023-20262 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-20262 being exploited?

There is no known exploitation of CVE-2023-20262 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-2023-20262 and fix it if it is affected.

What it is: CVE-2023-20262 is a medium-severity denial of service vulnerability in Cisco Catalyst Sd-Wan Manager, published on 27 Sep 2023. 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-2023-20262 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-2023-20262/ (Markdown: https://insights.sbomify.com/CVE-2023-20262/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-20262
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-20262
- OSV: https://osv.dev/vulnerability/CVE-2023-20262

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-20262/
Summaries are generated and may contain mistakes; the official description above is the record.