CVE-2024-37302— Synapse denial of service through media disk space consumption
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I. Basic Information for CVE-2024-37302
Vulnerability Information
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Vulnerability Title
Synapse denial of service through media disk space consumption
Source: NVD (National Vulnerability Database)
Vulnerability Description
Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new "leaky bucket" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
Element Synapse 安全漏洞
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 1.106之前版本存在安全漏洞，该漏洞源于容易受到磁盘填充攻击，未经身份验证的攻击者可以诱使Synapse下载和缓存大量远程媒体，可能会导致拒绝服务。
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| element-hq | synapse | < 1.106 | - |
II. Public POCs for CVE-2024-37302
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|---|
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Same Patch Batch · element-hq · 2024-12-03 · 6 CVEs total
| CVE-2024-37303 | 5.3 MEDIUM | Synapse unauthenticated writes to the media repository allow planting of problematic conte |
| CVE-2024-53867 | 4.3 MEDIUM | Synapse Matrix has a partial room state leak via Sliding Sync |
| CVE-2024-53863 | Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially | |
| CVE-2024-52815 | Synapse allows a a malformed invite to break the invitee's `/sync` | |
| CVE-2024-52805 | Synapse allows unsupported content types to lead to memory exhaustion |
IV. Related Vulnerabilities
Same product: synapse
- CVE-2025-61672
Synapse: Invalid device keys degrade federation functionalit - CVE-2025-30355
Synapse vulnerable to federation denial of service via malfo - CVE-2024-37303
Synapse unauthenticated writes to the media repository allow - CVE-2024-52805
Synapse allows unsupported content types to lead to memory e - CVE-2024-52815
Synapse allows a a malformed invite to break the invitee's `
Same vendor: element-hq
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ESS Community Helm Chart has a weak server key generation me - CVE-2025-62425
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In Element Web and Element Desktop, a malicious room can hid - CVE-2025-27599
Element X Android vulnerable to loading malicious web pages
Same weakness: CWE-770
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