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CVE-2024-37302— Synapse denial of service through media disk space consumption

Quick assessment

Affected
element-hq synapse
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 0.60% · P46
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
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

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7111 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2024-37302

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Vendor Advisories for CVE-2024-37302 (1)

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
Same vendor: element-hq
Same weakness: CWE-770

V. Comments for CVE-2024-37302

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