CVE-2025-24946Network attack vector

Server stall via predictable SCID hash collisions

Published Feb 20, 2025 · Updated Feb 20, 2025

Hash denial of service in Private Octopus picoquic before b80fd3f allows remote attackers to stall servers with colliding QUIC SCIDs. The connection-management picohash table keys peer-chosen SCIDs with a predictable unseeded hash, making crafted collisions drive quadratic insertion and lookup work. Any unauthenticated client able to reach a picoquic-based QUIC server can consume most of its CPU and substantially slow connection handling.

CVSS severity5.3
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hash denial of service in Private Octopus picoquic before b80fd3f allows remote attackers to stall servers with colliding QUIC SCIDs. The connection-management picohash table keys peer-chosen SCIDs with a predictable unseeded hash, making crafted collisions drive quadratic insertion and lookup work. Any unauthenticated client able to reach a picoquic-based QUIC server can consume most of its CPU and substantially slow connection handling.

The record

CVE
CVE-2025-24946
Published
Feb 20, 2025
Updated
Feb 20, 2025
Vendor
Private Octopus
Product
picoquic
Classifications
CWE-407, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <b80fd3f5903279ae3e7714ee4109363d9ab4491a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Private Octopus · picoquicversion=0 <b80fd3f5903279ae3e7714ee4109363d9ab4491a

Published CVSS scores

5.3MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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