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I. Basic Information for CVE-2025-30355
Vulnerability Information
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Vulnerability Title
Synapse vulnerable to federation denial of service via malformed events
Source: NVD (National Vulnerability Database)
Vulnerability Description
Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Element Synapse 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Element Synapse是Element开源的一个开源 Matrix 家庭服务器实现。 Element Synapse 1.127.0及之前版本存在输入验证错误漏洞，该漏洞源于恶意服务器可阻止与其他服务器联合。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
element-hqsynapse < 1.127.1 -
II. Public POCs for CVE-2025-30355
#POC DescriptionSource LinkShenlong Link
1A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild.https://github.com/ui-bootstrap/CVE-2025-30355POC Details
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III. Intelligence Information for CVE-2025-30355
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IV. Related Vulnerabilities
Same product: synapse
Same vendor: element-hq
Same weakness: CWE-20
V. Comments for CVE-2025-30355

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