What is CVE-2021-21304?

CVE-2021-21304 is a high-severity security vulnerability in dynamoose (npm), affecting versions >= 2.0.0, < 2.7.0. It is fixed in 2.7.0.

How severe is CVE-2021-21304?

CVE-2021-21304 has a CVSS score of 7.2 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of dynamoose are affected by CVE-2021-21304?

dynamoose (npm) versions >= 2.0.0, < 2.7.0 is affected.

Is there a fix for CVE-2021-21304?

Yes. CVE-2021-21304 is fixed in 2.7.0. Upgrade to this version or later.

Is CVE-2021-21304 exploitable, and should I be worried?

Whether CVE-2021-21304 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2021-21304 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix CVE-2021-21304?

Upgrade dynamoose to 2.7.0 or later.

CVE-2021-21304 in dynamoose

Q: How severe is CVE-2021-21304?

CVE-2021-21304 has a CVSS score of 7.2 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of dynamoose are affected by CVE-2021-21304?

dynamoose (npm) versions >= 2.0.0, < 2.7.0 is affected.

Q: Is there a fix for CVE-2021-21304?

Yes. CVE-2021-21304 is fixed in 2.7.0. Upgrade to this version or later.

Q: Is CVE-2021-21304 exploitable, and should I be worried?

Whether CVE-2021-21304 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2021-21304 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2021-21304?

Upgrade dynamoose to 2.7.0 or later.

Summary

Prototype Pollution in Dynamoose

Workarounds

We are unaware of any workarounds to patch this vulnerability other than upgrading to v2.7.0 or greater.

References

Patch commit hash: 324c62b4709204955931a187362f8999805b1d8e

For more information

If you have any questions or comments about this advisory:

Credit

GitHub CodeQL Code Scanning

Impact

In Dynamoose versions 2.0.0-2.6.0 there was a prototype pollution vulnerability in the internal utility method lib/utils/object/set.ts. This method is used throughout the codebase for various operations throughout Dynamoose.

We have not seen any evidence of this vulnerability being exploited.

We do not believe this issue impacts v1.x.x since this method was added as part of the v2 rewrite. This vulnerability also impacts v2.x.x beta/alpha versions.

CVE-2021-21304 has a CVSS score of 7.2 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.7.0); upgrading removes the vulnerable code path.

Affected versions

dynamoose (>= 2.0.0, < 2.7.0)

Security releases

dynamoose → 2.7.0 (npm)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

v2.7.0 includes a patch for this vulnerability.

Frequently Asked Questions

What is CVE-2021-21304? CVE-2021-21304 is a high-severity security vulnerability in dynamoose (npm), affecting versions >= 2.0.0, < 2.7.0. It is fixed in 2.7.0.
How severe is CVE-2021-21304? CVE-2021-21304 has a CVSS score of 7.2 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of dynamoose are affected by CVE-2021-21304? dynamoose (npm) versions >= 2.0.0, < 2.7.0 is affected.
Is there a fix for CVE-2021-21304? Yes. CVE-2021-21304 is fixed in 2.7.0. Upgrade to this version or later.
Is CVE-2021-21304 exploitable, and should I be worried? Whether CVE-2021-21304 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2021-21304 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2021-21304? Upgrade dynamoose to 2.7.0 or later.