CVE-2021-37580
High PUBLISHEDApache ShenYu Admin bypass JWT authentication
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
A flaw was found in Apache ShenYu Admin. The incorrect use of JWT in ShenyuAdminBootstrap allows an attacker to bypass authentication. This issue affected Apache ShenYu 2.3.0 and 2.4.0
- CVE Published
- Nov 16, 2021
- Exploitation Reported
- Jul 08, 2026
- CVSS
- 9.8 Critical
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Apache Software Foundation |
Apache ShenYu Admin
|
Apache ShenYu Admin 2.3.0-2.4.0 |
Affected |
CVE References
- [oss-security] 20211116 CVE-2021-37580: Apache ShenYu Admin bypass JWT authentication openwall.com · Mailing List http://www.openwall.com/lists/oss-security/2021/11/16/1
- Apache Mailing List lists.apache.org · CVE Record https://lists.apache.org/thread/o15j25qwtpcw62k48xw1tnv48skh3zgb
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-11-08 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-37580.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2026-07-08 00:00:00 UTC · The Shadowserver
Proof of concept available
Recorded 2021-11-17 13:26:46 UTC · GitHub
Weaknesses (CWE)
-
Improper Authentication
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-37580.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2021-11-19 08:21:44 UTC · 5 stars
github · Created 2021-11-17 08:33:25 UTC · 4 stars
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 9 months ago00:00 UTC · 9 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
08:33 UTC over 4 years ago08:33 UTC · over 4 years ago
Public PoC available
Public proof-of-concept code published
-
09:35 UTC over 4 years ago09:35 UTC · over 4 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC almost 5 years ago00:00 UTC · almost 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-37580
{
"cve_id": "CVE-2021-37580",
"title": "Apache ShenYu Admin bypass JWT authentication",
"affected_vendor": "Apache Software Foundation",
"affected_product": "Apache ShenYu Admin",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 9.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}