HOMEVULNERABILITIESCVE-2021-21278
CRITICAL

CVE-2021-21278

CWE-74Published: January 26, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-21278 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

rsshub1 product(s)
rsshub
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/DIYgod/RSSHub/commit/7f1c43094e8a82e4d8f036ff7d42568fed00699d
PATCHhttps://github.com/DIYgod/RSSHub/commit/7f1c43094e8a82e4d8f036ff7d42568fed00699d
ADVISORYhttps://github.com/DIYgod/RSSHub/security/advisories/GHSA-pgjj-866w-fc5c
ADVISORYhttps://www.npmjs.com/package/rsshub
ADVISORYhttps://github.com/DIYgod/RSSHub/security/advisories/GHSA-pgjj-866w-fc5c
ADVISORYhttps://www.npmjs.com/package/rsshub

All References (6)

→
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

Quick Facts

CVE IDCVE-2021-21278
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedJan 26, 2021

Related CVEs (CWE-74)

CVE-2023-1523
10.0
CVE-2026-54159
10.0
CVE-2024-38366
10.0
CVE-2026-44182
10.0
CVE-2025-20265
10.0
CVE-2020-26282
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-21278 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-21278·NVD