# CVE-2020-5303: Denial of service in Tendermint

Source: https://junglewise.ai/threats/cve-2020-5303-denial-of-service-in-tendermint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-05-27  
License: CC BY 4.0 with a link back

CVE-2020-5303 · Severity: low · CVSS 3.1 · Published 2021-05-27

Denial of service in Tendermint

Technologies: [github.com/tendermint/tendermint (Go)](https://junglewise.ai/threats/technologies/github-com-tendermint-tendermint). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2020-5303 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-5303 being exploited in the wild.

**How severe is CVE-2020-5303?** Low severity, with a CVSS score of 3.1, published 27 May 2021.

**Which products and versions are affected?** github.com/tendermint/tendermint (Go) SEMVER:introduced=0.33.0,fixed=0.33.3.

**Is there a fix for CVE-2020-5303?** Yes. github.com/tendermint/tendermint (Go): upgrade to 0.33.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-5303?** Check whether you run github.com/tendermint/tendermint (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/tendermint/tendermint (Go): upgrade to 0.33.3 or later

  ```sh
  go get github.com/tendermint/tendermint@v0.33.3
  ```


## Affected products

- github.com/tendermint/tendermint (Go) SEMVER:introduced=0.33.0,fixed=0.33.3

## Identifiers

- CVE-2020-5303
- GHSA-v24h-pjjv-mcp6

## Related threats

- [GO-2022-1052 - Uncontrolled resource consumption during consensus in github.com/tendermint/tendermint](https://junglewise.ai/threats/cve-2021-21271-tendermint-core-vulnerable-to-uncontrolled-resource-consumption)
- [Signature verification failure in Tendermint](https://junglewise.ai/threats/signature-verification-failure-in-tendermint-8a0f3d11)
- [GO-2021-0090 - Denial of service in github.com/tendermint/tendermint](https://junglewise.ai/threats/cve-2020-15091-denial-of-service-in-tendermint)
- [GO-2020-0037 - Uncontrolled resource consumption in github.com/tendermint/tendermint](https://junglewise.ai/threats/cve-2019-25072-tendermint-client-package-vulnerable-to-uncontrolled-resource)