CVE-2025-4820 affects Cloudflare quiche, where incorrect congestion window growth allows it to send data faster than the network path can support. An unauthenticated remote attacker can exploit this by manipulating the victim's congestion control state through opportunistic ACK attacks, leading to an enlarged congestion window. This vulnerability is rated Medium severity (CVSS 5.3) with a low impact on availability, and there is currently no evidence of active exploitation, public exploit code, or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.24.4CPE matchmatch criteria | cpe:2.3:a:cloudflare:quiche:*:*:*:*:*:rust:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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