Vulnerability in Cloudflare Quiche - Incorrect Congestion Window Growth
CVE-2025-4820

5.3MEDIUM

Key Information:

Vendor

Cloudflare

Status
Quiche
Vendor
CVE Published:
18 June 2025

What is CVE-2025-4820?

The Cloudflare Quiche is susceptible to a vulnerability involving incorrect congestion window growth, allowing unauthenticated remote attackers to manipulate data transfer rates. By completing a handshake, the attacker can exploit the congestion control mechanisms through an opportunistic ACK attack, potentially allowing more data to be in transit than the underlying network can sustain. This could lead to degraded performance and unreliable connections for users.

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Affected Version(s)

quiche <0.24.4

References

https://github.com/cloudflare/quiche/security/advisories/...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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