# CVE-2020-3358: Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers SSL Denial of Service Vulnerability

> Unauthenticated remote attackers can cause Cisco RV routers to restart via crafted SSL requests, resulting in denial of service.

- **Severity:** High 8.6 (`CVSS:3.1/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:** 16 Jul 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-rjmm-h25r-cqxf

## What is CVE-2020-3358?

CVE-2020-3358 is a high-severity denial of service vulnerability in Cisco Small Business RV Series Router Firmware, published on 16 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Secure Sockets Layer (SSL) VPN feature for Cisco Small Business RV VPN Routers could allow an unauthenticated, remote attacker to cause the device to unexpectedly restart, causing a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request over an SSL connection to the targeted device. A successful exploit could allow the attacker to cause a reload, resulting in a DoS condition.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-3358?

It affects 4 products.


Products: Cisco Rv340 Dual Wan Gigabit Vpn Router Firmware, Cisco Rv340w Dual Wan Gigabit Wireless-Ac Vpn Router Firmware, Cisco Rv345 Dual Wan Gigabit Vpn Router Firmware, Cisco Rv345p Dual Wan Gigabit Poe Vpn Router Firmware.

## How do I fix CVE-2020-3358?

No fix has been published for CVE-2020-3358 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3358 being exploited?

There is no known exploitation of CVE-2020-3358 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Small Business RV Series Router Firmware

- [CVE-2020-3357](https://insights.sbomify.com/CVE-2020-3357/): Other in Cisco Small Business RV Series Router Firmware (critical 9.8)
- [CVE-2024-20393](https://insights.sbomify.com/CVE-2024-20393/): Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Privilege Escalation Vulnerability (high 8.8)
- [CVE-2024-20470](https://insights.sbomify.com/CVE-2024-20470/): Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Remote Code Execution Vulnerability (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3358 and fix it if it is affected.

What it is: CVE-2020-3358 is a high-severity denial of service vulnerability in Cisco Small Business RV Series Router Firmware, published on 16 Jul 2020. 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-2020-3358 in the wild and no public exploit code.

Affected product: Cisco Small Business RV Series Router Firmware. 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-2020-3358/ (Markdown: https://insights.sbomify.com/CVE-2020-3358/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3358
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3358
- OSV: https://osv.dev/vulnerability/CVE-2020-3358

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3358/
Summaries are generated and may contain mistakes; the official description above is the record.