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CVE-2021-21274

🗓️ 26 Feb 2021 17:25:16Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov📰️ 5 Media mentions👁 121 Views

Synapse Matrix reference homeserver before 1.25.0 allows redirection to large file in .well-known, leading to denial of service

Related
Detection
Affected
Refs
Social
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2021-21274
26 Feb 202118:15
attackerkb
circl
Circl
CVE-2021-21274
26 Feb 202120:39
circl
cnnvd
CNNVD
Matrix Synapse 资源管理错误漏洞
26 Feb 202100:00
cnnvd
cnvd
CNVD
Matrix Synapse Denial of Service Vulnerability (CNVD-2021-15493)
2 Mar 202100:00
cnvd
cvelist
Cvelist
CVE-2021-21274 Denial of service attack via .well-known lookups
26 Feb 202117:25
cvelist
debiancve
Debian CVE
CVE-2021-21274
26 Feb 202117:25
debiancve
euvd
EUVD
EUVD-2021-0124
7 Oct 202500:30
euvd
fedora
Fedora
[SECURITY] Fedora 34 Update: matrix-synapse-1.38.1-1.fc34
2 Aug 202101:05
fedora
github
Github Security Blog
Denial of service attack via .well-known lookups
1 Mar 202119:34
github
nvd
NVD
CVE-2021-21274
26 Feb 202118:15
nvd
Rows per page
NVD
Vulners
Node
matrixsynapseRange0.99.01.25.0
[
  {
    "product": "synapse",
    "vendor": "matrix-org",
    "versions": [
      {
        "status": "affected",
        "version": ">=0.99.0, < 1.25.0"
      }
    ]
  }
]

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17 Jun 2026 03:35Current
5.4Medium risk
Vulners AI Score5.4
CVSS 24.3
CVSS 3.14.3 - 6.5
EPSS0.02164
121