CVE-2025-7054 Infinite loop triggered by connection ID retirement
An unauthenticated remote attacker can cause a denial of service in the quiche library by triggering an infinite loop during connection ID retirement.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-7054?
CVE-2025-7054 is a high-severity denial of service vulnerability in Cloudflare quiche, published on 7 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Cloudflare 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.
Weakness: CWE-835
Which versions are affected by CVE-2025-7054?
2 open source packages ship an affected version, including quiche. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
quiche crates.io | From 0.15.0 | 0.24.5 |
quiche crates.io | From 0.15.0 | 0.24.5 |
Products include Cloudflare Quiche.
How do I fix CVE-2025-7054?
Upgrade quiche to 0.24.5 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-7054 being exploited?
There is no known exploitation of CVE-2025-7054 in the wild and no public exploit code.
Other vulnerabilities in Cloudflare quiche
- CVE-2026-12523 Resource exhaustion in quiche HTTP/3 and QPACK layers
- CVE-2025-4821 Incorrect congestion window growth by invalid ACK ranges
- CVE-2024-1765 Unlimited resource allocation by QUIC CRYPTO frames flooding in quiche
- CVE-2025-4820 Incorrect congestion window growth by optimistic ACK
- CVE-2023-6193 Unbounded queuing of path validation messages in cloudflare-quiche
Sources
Also known as GHSA-m3hh-f9gh-74c2.