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MEDIUM severity

CVE-2024-1765 — quiche

MEDIUMFix: cloudflare/quiche@1017466

CVE-2024-1765 is a medium-severity (CVSS 5.9) Uncontrolled Resource Consumption vulnerability in quiche. A fix is available for quiche — see the affected versions and patch details below.

Unlimited resource allocation by QUIC CRYPTO frames flooding in quiche

Also known asGHSA-78wx-jg4j-5j6g
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-1765.

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs66th percentile — riskier than 66% of all scored CVEsHighest risk
0.00%2.27%4.54%6.80%4.7%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🦀quiche🦀quiche

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Impact

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.

Patches

Quiche 0.19.2 and 0.20.1 are the earliest versions containing the fix for this issue.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.ioquicheall versions0.19.2cargo update -p quiche --precise 0.19.2
🦀crates.ioquiche≥ 0.20.0&&< 0.20.10.20.1cargo update -p quiche --precise 0.20.1

Affected Products

1 product · 2 configurations
Application
quichecloudflare
< 0.19.2
1 version
0.20.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for quiche, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update quiche to 0.19.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-1765 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact 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. ### Patches Quiche 0.19.2 and 0.20.1 are the earliest versions containing the fix for this issue.
O3 Security · Impact-Aware SCA

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CVE-2024-1765: quiche — Fixed in 0.19.2