# CVE-2021-1511: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities

> Attackers can execute arbitrary code as root or cause denial of service on Cisco SD-WAN vEdge routers via buffer overflow vulnerabilities.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 May 2021
- **Updated:** 8 Nov 2024
- **Also known as:** GHSA-88h6-hmmq-34qm

## What is CVE-2021-1511?

CVE-2021-1511 is a high-severity memory corruption vulnerability in Cisco SD-WAN vEdge router, published on 6 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Multiple vulnerabilities in Cisco SD-WAN vEdge Software could allow an attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2021-1511?

It affects 8 products.


Products: 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.

## How do I fix CVE-2021-1511?

No fix has been published for CVE-2021-1511 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1511 being exploited?

There is no known exploitation of CVE-2021-1511 in the wild and no public exploit code.

## Other vulnerabilities in Cisco SD-WAN vEdge router

- [CVE-2018-0432](https://insights.sbomify.com/CVE-2018-0432/): Cisco SD-WAN Solution Privilege Escalation Vulnerability (high 8.8)
- [CVE-2021-1509](https://insights.sbomify.com/CVE-2021-1509/): Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities (high 7.5)
- [CVE-2021-1510](https://insights.sbomify.com/CVE-2021-1510/): Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities (high 7.5)
- [CVE-2018-0434](https://insights.sbomify.com/CVE-2018-0434/): Cisco SD-WAN Solution Certificate Validation Vulnerability (high 7.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1511 and fix it if it is affected.

What it is: CVE-2021-1511 is a high-severity memory corruption vulnerability in Cisco SD-WAN vEdge router, published on 6 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-1511 in the wild and no public exploit code.

Affected product: Cisco SD-WAN vEdge router. 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-2021-1511/ (Markdown: https://insights.sbomify.com/CVE-2021-1511/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1511
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1511
- OSV: https://osv.dev/vulnerability/CVE-2021-1511

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1511/
Summaries are generated and may contain mistakes; the official description above is the record.