Unbounded storage of information related to connection ID retirement, in quiche
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
Cloudflare quiche was discovered to be vulnerable to unbounded storage of information related to connection ID retirement, which could lead to excessive resource consumption. Each QUIC connection possesses a set of connection Identifiers (IDs); see RFC 9000 Section 5.1 https://datatracker.ietf.org/doc/html/rfc9000#section-5.1 . Endpoints declare the number of active connection IDs they are willing to support using the active_connection_id_limit transport parameter. The peer can create new IDs using a NEW_CONNECTION_ID frame but must stay within the active ID limit. This is done by retirement of old IDs, the endpoint sends NEW_CONNECTION_ID includes a value in the retire_prior_to field, which elicits a RETIRE_CONNECTION_ID frame as confirmation. An unauthenticated remote attacker can exploit the vulnerability by sending NEW_CONNECTION_ID frames and manipulating the connection (e.g. by restricting the peer's congestion window size) so that RETIRE_CONNECTION_ID frames can only be sent at a slower rate than they are received, leading to storage of information related to connection IDs in an unbounded queue. Quiche versions 0.19.2 and 0.20.1 are the earliest to address this problem. There is no workaround for affected versions.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cloudflare | quiche | 0.15.0 to before <0.19.2; 0.20.0 to before <0.20.1 | <0.19.2, <0.20.1 | Patch available | CNA |
| — | quiche (crates.io) | before 0.19.2 | 0.19.2 | Patch available | GHSA-xhg9-xwch-vr7x |
| — | quiche (crates.io) | 0.20.0 to before 0.20.1 | 0.20.1 | Patch available | GHSA-xhg9-xwch-vr7x |
- quiche VendorCloudflare Affected 0.15.0 to before <0.19.2; 0.20.0 to before <0.20.1 Fixed in <0.19.2, <0.20.1 Patch available CNA
- quiche (crates.io) Vendor— Affected before 0.19.2 Fixed in 0.19.2 Patch available GHSA-xhg9-xwch-vr7x
- quiche (crates.io) Vendor— Affected 0.20.0 to before 0.20.1 Fixed in 0.20.1 Patch available GHSA-xhg9-xwch-vr7x
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cloudflare:quiche:*:*:*:*:*:rust:*:* | before 0.19.2 | Vulnerable | Cloudflare |
| cpe:2.3:a:cloudflare:quiche:0.20.0:*:*:*:*:rust:*:* | 0.20.0 | Vulnerable | Cloudflare |
- cpe:2.3:a:cloudflare:quiche:*:*:*:*:*:rust:*:* Versions before 0.19.2 Vulnerable ·Cloudflare
- cpe:2.3:a:cloudflare:quiche:0.20.0:*:*:*:*:rust:*:* Versions 0.20.0 Vulnerable ·Cloudflare
Remediation
- Fix · CNA quiche (Cloudflare) Fixed in <0.19.2, <0.20.1
- Fix · GHSA-xhg9-xwch-vr7x quiche (crates.io) Fixed in 0.19.2 Advisory →
- Fix · GHSA-xhg9-xwch-vr7x quiche (crates.io) Fixed in 0.20.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-1410
- 2026-10-03 Alias added: GHSA-xhg9-xwch-vr7x
- 2026-10-06 EPSS moved to the 50th–90th percentile
References
Advisory 2
Other 7
- https://github.com/cloudflare/quiche/commit/0c5733a84c41e9e178adc866b11ce59ac264f5af
- https://github.com/cloudflare/quiche/commit/5be8143126f8cfa8a483d4a5ae475b9a46053fa1
- https://github.com/cloudflare/quiche/commit/7ab42af5f5e97f20f1d63b7ea2f9ab0536678c40
- https://github.com/cloudflare/quiche/commit/a983998c4408605905ee9a6ab0fc00e68436ac67
- https://github.com/cloudflare/quiche
- https://github.com/cloudflare/quiche/releases/tag/0.19.2
- https://github.com/cloudflare/quiche/releases/tag/0.20.1
More Cloudflare Quiche vulnerabilities
- TI-2025-06417 Infinite loop triggered by connection ID retirement CVSS 4.0HIGH 8.7
- TI-2025-04316 Incorrect congestion window growth by invalid ACK ranges CVSS 3.1HIGH 7.5
- TI-2026-10747 Resource exhaustion in quiche HTTP/3 and QPACK layers CVSS 3.1HIGH 7.5
- TI-2024-01642 Unlimited resource allocation by QUIC CRYPTO frames flooding in quiche CVSS 3.1HIGH 7.5
- TI-2025-04315 Incorrect congestion window growth by optimistic ACK CVSS 3.1MEDIUM 5.3
- TI-2023-05687 Unbounded queuing of path validation messages in cloudflare-quiche CVSS 3.1MEDIUM 5.3
Sources
- CVE-2024-1410 · CVE Program
- CVE-2024-1410 · NVD
- FIRST EPSS
- GHSA-xhg9-xwch-vr7x · GitHub Advisory Database · CC BY 4.0
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