EUVD-2021-0123

🗓️ 07 Oct 2025 00:30:54Reported by EUVDType

Synapse before 1.25.0 lacked IP restrictions for third-party invites, risking internal requests. Upgrade advised.

Reporter	Title	Published	Views	Family All 23
Circl	CVE-2021-21273	26 Feb 202120:39	–	circl
CNNVD	Matrix Synapse Input Validation Error Vulnerability	26 Feb 202100:00	–	cnnvd
CVE	CVE-2021-21273	26 Feb 202117:25	–	cve
Cvelist	CVE-2021-21273 Open redirects on some federation and push requests	26 Feb 202117:25	–	cvelist
Debian CVE	CVE-2021-21273	26 Feb 202117:25	–	debiancve
Fedora	[SECURITY] Fedora 34 Update: matrix-synapse-1.38.1-1.fc34	2 Aug 202101:05	–	fedora
Github Security Blog	Open redirects on some federation and push requests	26 Feb 202117:28	–	github
NVD	CVE-2021-21273	26 Feb 202118:15	–	nvd
OpenVAS	Fedora: Security Advisory for matrix-synapse (FEDORA-2021-a627cfd31e)	2 Aug 202100:00	–	openvas
OSV	DEBIAN-CVE-2021-21273	26 Feb 202118:15	–	osv

[
  {
    "enisaIdVendor": [
      {
        "id": "08b706b2-5840-3a5e-ab95-d5a3bb1c6b05",
        "vendor": {
          "name": "matrix-org"
        }
      }
    ],
    "enisaIdProduct": [
      {
        "id": "5be97fb2-9a86-3dea-94b7-c25ea9937d3e",
        "product": {
          "name": "synapse"
        },
        "product_version": "< 1.25.0"
      }
    ]
  }
]

Source	Link
github	www.github.com/matrix-org/synapse/releases/tag/v1.25.0
github	www.github.com/matrix-org/synapse/commit/30fba6210834a4ecd91badf0c8f3eb278b72e746
github	www.github.com/matrix-org/synapse/security/advisories/GHSA-v936-j8gp-9q3p
github	www.github.com/matrix-org/synapse/pull/8821
nvd	www.nvd.nist.gov/vuln/detail/CVE-2021-21273
github	www.github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-131.yaml
lists	www.lists.fedoraproject.org/archives/list/[email protected]/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY
suse	www.suse.com/security/cve/CVE-2021-21273.html
lists	www.lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
github	www.github.com/advisories/GHSA-293c-r3p4-g63r

07 Oct 2025 00:30Current

6.1Medium risk

Vulners AI Score6.1

CVSS 3.13.1 - 6.1

CVSS 25.8

EPSS0.00322