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CVE-2025-47950— CoreDNS Vulnerable to DoQ Memory Exhaustion via Stream Amplification

Quick assessment

Affected
coredns coredns
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.

CoreDNS是CoreDNS社区的一个 DNS 服务器。 CoreDNS 1.12.2之前版本存在安全漏洞，该漏洞源于资源消耗不受控制，可能导致拒绝服务。

CVSS 7.5 · High EPSS 1.17% · P65
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I. Basic Information for CVE-2025-47950

Vulnerability Information
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Vulnerability Title
CoreDNS Vulnerable to DoQ Memory Exhaustion via Stream Amplification
Source: CVE Program / CVE List V5
Vulnerability Description
CoreDNS is a DNS server that chains plugins. In versions prior to 1.12.2, a Denial of Service (DoS) vulnerability exists in the CoreDNS DNS-over-QUIC (DoQ) server implementation. The server previously created a new goroutine for every incoming QUIC stream without imposing any limits on the number of concurrent streams or goroutines. A remote, unauthenticated attacker could open a large number of streams, leading to uncontrolled memory consumption and eventually causing an Out Of Memory (OOM) crash — especially in containerized or memory-constrained environments. The patch in version 1.12.2 introduces two key mitigation mechanisms: `max_streams`, which caps the number of concurrent QUIC streams per connection with a default value of `256`; and `worker_pool_size`, which Introduces a server-wide, bounded worker pool to process incoming streams with a default value of `1024`. This eliminates the 1:1 stream-to-goroutine model and ensures that CoreDNS remains resilient under high concurrency. Some workarounds are available for those who are unable to upgrade. Disable QUIC support by removing or commenting out the `quic://` block in the Corefile, use container runtime resource limits to detect and isolate excessive memory usage, and/or monitor QUIC connection patterns and alert on anomalies.
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
CoreDNS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreDNS是CoreDNS社区的一个 DNS 服务器。 CoreDNS 1.12.2之前版本存在安全漏洞，该漏洞源于资源消耗不受控制，可能导致拒绝服务。
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
coredns coredns < 1.12.2 -

II. Public POCs for CVE-2025-47950

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7993 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2025-47950

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Patches & Fixes for CVE-2025-47950 (1)

Vendor Advisories for CVE-2025-47950 (1)

Vendor Pages for CVE-2025-47950 (1)

Other References for CVE-2025-47950 (1)

IV. Related Vulnerabilities

Same product: coredns
Same vendor: coredns
Same weakness: CWE-770

V. Comments for CVE-2025-47950

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