Unlimited resource allocation by QUIC CRYPTO frames flooding 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 · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
Cloudflare Quiche (through version 0.19.1/0.20.0) was affected by an unlimited resource allocation vulnerability causing rapid increase of memory usage of the system running quiche server or client. A remote attacker could take advantage of this vulnerability by repeatedly sending an unlimited number of 1-RTT CRYPTO frames after previously completing the QUIC handshake. Exploitation was possible for the duration of the connection which could be extended by the attacker. quiche 0.19.2 and 0.20.1 are the earliest versions containing the fix for this issue.
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 – <0.19.1; 0.20.0 to before <0.20.1 | <0.20.1 | Patch available | CNA |
| — | quiche (crates.io) | before 0.19.2 | 0.19.2 | Patch available | GHSA-78wx-jg4j-5j6g |
| — | quiche (crates.io) | 0.20.0 to before 0.20.1 | 0.20.1 | Patch available | GHSA-78wx-jg4j-5j6g |
- quiche VendorCloudflare Affected 0.15.0 – <0.19.1; 0.20.0 to before <0.20.1 Fixed in <0.20.1 Patch available CNA
- quiche (crates.io) Vendor— Affected before 0.19.2 Fixed in 0.19.2 Patch available GHSA-78wx-jg4j-5j6g
- quiche (crates.io) Vendor— Affected 0.20.0 to before 0.20.1 Fixed in 0.20.1 Patch available GHSA-78wx-jg4j-5j6g
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 <0.20.1
- Fix · GHSA-78wx-jg4j-5j6g quiche (crates.io) Fixed in 0.19.2 Advisory →
- Fix · GHSA-78wx-jg4j-5j6g quiche (crates.io) Fixed in 0.20.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-1765
- 2026-10-03 Alias added: GHSA-78wx-jg4j-5j6g
References
Advisory 2
Other 5
- https://github.com/cloudflare/quiche/commit/1017466c143fc93a82b286a1ba35e53334cdf8e2
- https://github.com/cloudflare/quiche/commit/11dbf5461ab657bbc02e466d719070124b27ef3c
- 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-2025-04315 Incorrect congestion window growth by optimistic ACK CVSS 3.1MEDIUM 5.3
- TI-2024-01317 Unbounded storage of information related to connection ID retirement, in quiche CVSS 3.1MEDIUM 5.3
- TI-2023-05687 Unbounded queuing of path validation messages in cloudflare-quiche CVSS 3.1MEDIUM 5.3
Sources
- CVE-2024-1765 · CVE Program
- CVE-2024-1765 · NVD
- FIRST EPSS
- GHSA-78wx-jg4j-5j6g · GitHub Advisory Database · CC BY 4.0
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