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CVE-2021-37580

64
FAUCET Score

CVE-2021-37580 is a critical authentication bypass vulnerability in Apache ShenYu Admin versions 2.3.0 and 2.4.0, stemming from improper JWT usage. With a CVSS score of 9.8, it allows unauthenticated remote attackers to fully compromise the system, leading to high confidentiality, integrity, and availability impacts. While not currently on the CISA KEV catalog or showing active exploitation, a Nuclei template exists for detection, and its high EPSS score indicates a significant likelihood of future exploitation. Despite its severity, there is minimal public discussion or media coverage surrounding this flaw.

Impacted Technologies

VendorProductVersion(s)CPE
2.3.0CPE matchmatch criteria
cpe:2.3:a:apache:shenyu:2.3.0:*:*:*:*:*:*:*
2.4.0CPE matchmatch criteria
cpe:2.3:a:apache:shenyu:2.4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
40.06%
Probability of exploitation in next 30 days
EPSS Percentile
98.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Nuclei: CVE-2021-37580 · Nov 19, 2021
This CVE's current EPSS score of 0.4006 is in the 96th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.shenyu:shenyu-adminFixed in: 2.4.1

Vendor Advisories (1)

mavenGHSA-vpfp-5gwq-g533critical

Improper Authentication in Apache ShenYu Admin

Nov 17, 2021

References

lists.apache.org / thread/o15j25qwtpcw62k48xw1tnv48skh3zgb
Mailing ListVendor Advisory
openwall.com / lists/oss-security/2021/11/16/1
Mailing ListThird Party Advisory