CVE-2021-21278

Name: CVE-2021-21278
Creator: NVD / NIST
Published: 2021-01-26T21:15:12.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.57%

Last modified Jun 17, 2026

CVE-2021-21278 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. RSSHub is an open source, easy to use, and extensible RSS feed generator. In RSSHub before version 7f1c430 (non-semantic versioning) there is a risk of code injection. EPSS estimates a 1.57% chance of exploitation in the next 30 days.

Description

RSSHub is an open source, easy to use, and extensible RSS feed generator. In RSSHub before version 7f1c430 (non-semantic versioning) there is a risk of code injection. Some routes use `eval` or `Function constructor`, which may be injected by the target site with unsafe code, causing server-side security issues The fix in version 7f1c430 is to temporarily remove the problematic route and added a `no-new-func` rule to eslint.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.57%

72.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Rsshub	Rsshub	< 2021-01-25

References

https://github.com/DIYgod/RSSHub/commit/7f1c43094e8a82e4d8f036ff7d42568fed00699dPatch, Third Party Advisory
https://github.com/DIYgod/RSSHub/security/advisories/GHSA-pgjj-866w-fc5cThird Party Advisory
https://www.npmjs.com/package/rsshubProduct, Third Party Advisory
https://github.com/DIYgod/RSSHub/commit/7f1c43094e8a82e4d8f036ff7d42568fed00699dPatch, Third Party Advisory
https://github.com/DIYgod/RSSHub/security/advisories/GHSA-pgjj-866w-fc5cThird Party Advisory
https://www.npmjs.com/package/rsshubProduct, Third Party Advisory

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21278?

How severe is CVE-2021-21278?

CVE-2021-21278 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21278?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21278?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST