QuicheApplication · Cloudflare
CVE-2025-7054
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCloudflare quiche was discovered to be vulnerable to an infinite loop when sending packets containing RETIRE_CONNECTION_ID frames. QUIC connections possess a set of connection identifiers (IDs); see Section 5.1 of RFC 9000 https://datatracker.ietf.org/doc/html/rfc9000#section-5.1 . Once the QUIC handshake completes, a local endpoint is responsible for issuing and retiring Connection IDs that are used by the remote peer to populate the Destination Connection ID field in packets sent from remote to local. Each Connection ID has a sequence number to ensure synchronization between peers. An unauthenticated remote attacker can exploit this vulnerability by first completing a handshake and then sending a specially-crafted set of frames that trigger a connection ID retirement in the victim. When the victim attempts to send a packet containing RETIRE_CONNECTION_ID frames, Section 19.16 of RFC 9000 https://datatracker.ietf.org/doc/html/rfc9000#section-19.6 requires that the sequence number of the retired connection ID must not be the same as the sequence number of the connection ID used by the packet. In other words, a packet cannot contain a frame that retires itself. In scenarios such as path migration, it is possible for there to be multiple active paths with different active connection IDs that could be used to retire each other. The exploit triggered an unintentional behaviour of a quiche design feature that supports retirement across paths while maintaining full connection ID synchronization, leading to an infinite loop.This issue affects quiche: from 0.15.0 before 0.24.5.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCloudflare quiche contains an infinite loop vulnerability in the RETIRE_CONNECTION_ID frame handling logic. An attacker who completes a QUIC handshake can send specially-crafted frames that trigger connection ID retirement across multiple paths, causing the victim's send loop to iterate infinitely due to unintended behavior in quiche's path-synchronization design feature. This affects versions 0.15.0 through 0.24.4.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
QuicheApplication
>= 0.15.0, < 0.24.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify quiche installation and versionRun 'cargo list | grep quiche' if built with Cargo, or check package manager listings for quiche package, or inspect vendor/bundled library directories for quiche version filesAffected if quiche version is 0.15.0 through 0.24.4 inclusive
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Confirm QUIC server usageCheck if the application or service is configured to accept QUIC connections - review configuration files for quic/listen_address settings or examine running processes for QUIC listener ports (typically 443/UDP)Affected if The system operates as a QUIC server accepting incoming connections
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Verify external QUIC exposureReview firewall and network configuration to determine if UDP port 443 (or configured QUIC port) is exposed to untrusted networksAffected if QUIC service is reachable from untrusted network paths
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Monitor for infinite loop symptomsIf quiche is in use and version is affected, check for symptoms: process stuck in send loop consuming 100% CPU, connection hangs during connection ID retirement, or logs showing repeated RETIRE_CONNECTION_ID frame processingAffected if Process exhibits infinite loop behavior with high CPU during active QUIC connections
User is affected if Cloudflare quiche version 0.15.0-0.24.4 is installed and the system operates as a QUIC server exposed to network traffic.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped0.24.5
Upgrade quiche to version 0.24.5 or later to patch the infinite loop in connection ID retirement logic. No configuration changes can mitigate this; the fix requires code update.
quiche version 0.24.5
- Identify all projects or applications that depend on the quiche library
- Locate the dependency management file (e.g., Cargo.toml for Rust projects, or package manager configuration)
- Update the quiche dependency to version 0.24.5 or later
- Run dependency resolution to ensure the new version is pulled in
- Rebuild and redeploy the affected services
- Test that QUIC connections function normally, specifically testing connection ID retirement scenarios
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Quiche
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,096.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-7054 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-7054 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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