# CVE-2020-37085: VirtualTablet Server 3.0.2 - Denial of Service (PoC)

> Attackers can crash the VirtualTablet Server by sending oversized string payloads via the Thrift protocol, causing a denial of service.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Feb 2026
- **Updated:** 4 Feb 2026
- **Also known as:** GHSA-qwxg-wwj2-f994

## What is CVE-2020-37085?

CVE-2020-37085 is a high-severity denial of service vulnerability in SunnySideSoft VirtualTablet Server, published on 3 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

VirtualTablet Server 3.0.2 contains a denial of service vulnerability that allows attackers to crash the service by sending oversized string payloads through the Thrift protocol. Attackers can exploit the vulnerability by sending a long string to the send_say() method, causing the server to become unresponsive.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2020-37085?


## How do I fix CVE-2020-37085?

No fix has been published for CVE-2020-37085 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-37085 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37085 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-37085 and fix it if it is affected.

What it is: CVE-2020-37085 is a high-severity denial of service vulnerability in SunnySideSoft VirtualTablet Server, published on 3 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37085 exists.

Affected product: SunnySideSoft VirtualTablet Server. 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-2020-37085/ (Markdown: https://insights.sbomify.com/CVE-2020-37085/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-37085
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-37085
- OSV: https://osv.dev/vulnerability/CVE-2020-37085

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-37085/
Summaries are generated and may contain mistakes; the official description above is the record.