CVE-2023-49295Network attack vector

Service interruption via unbounded PATH_RESPONSE queue

Published Jan 10, 2024 · Updated Jun 17, 2025

Memory exhaustion in quic-go allows remote authenticated users to interrupt QUIC peers by sending crafted PATH_CHALLENGE frames. The framer's QueueControlFrame path appends a PATH_RESPONSE for every received challenge without bounding the queue while congestion-window and RTT manipulation prevents most responses from being sent. A peer able to maintain such a QUIC connection can exhaust process memory and interrupt service.

CVSS severity6.4
Medium
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in quic-go allows remote authenticated users to interrupt QUIC peers by sending crafted PATH_CHALLENGE frames. The framer's QueueControlFrame path appends a PATH_RESPONSE for every received challenge without bounding the queue while congestion-window and RTT manipulation prevents most responses from being sent. A peer able to maintain such a QUIC connection can exhaust process memory and interrupt service.

The record

CVE
CVE-2023-49295
Published
Jan 10, 2024
Updated
Jun 17, 2025
Vendor
quic-go
Product
quic-go
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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=< 0.37.7
  2. Affected versionversion=>= 0.38.0, < 0.38.2
  3. Affected versionversion=>= 0.39.0, < 0.39.4
  4. Affected versionversion== 0.40.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

quic-go · quic-goversion=< 0.37.7; version=>= 0.38.0, < 0.38.2; version=>= 0.39.0, < 0.39.4; version== 0.40.0

Published CVSS scores

6.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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