CVE-2021-37580Network attack vector

Unauthenticated admin access via hardcoded JWT secret

Published Nov 16, 2021 · Updated Aug 4, 2024

Improper authentication in Apache ShenYu Admin 2.3.0 through 2.4.0 allows remote attackers to access its dashboard with forged JWTs. ShiroRealm trusts the JWT issuer to select a dashboard user while a shared HMAC key is shipped in application.yml, allowing attackers to sign tokens for existing users. No credentials or user interaction are required; a forged token grants the selected user's administrative permissions.

CVSS severity9.8
Critical
EPSS probability41.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Apache ShenYu Admin 2.3.0 through 2.4.0 allows remote attackers to access its dashboard with forged JWTs. ShiroRealm trusts the JWT issuer to select a dashboard user while a shared HMAC key is shipped in application.yml, allowing attackers to sign tokens for existing users. No credentials or user interaction are required; a forged token grants the selected user's administrative permissions.

The record

CVE
CVE-2021-37580
Published
Nov 16, 2021
Updated
Aug 4, 2024
Vendor
Apache Software Foundation
Product
Apache ShenYu Admin
Classifications
CWE-287
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache ShenYu Admin 2.3.0-2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apache Software Foundation · Apache ShenYu Adminversion=Apache ShenYu Admin 2.3.0-2.4.0

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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