CVE-2024-1765Network attack vector

Memory exhaustion via post-handshake CRYPTO-frame flooding

Published Mar 12, 2024 · Updated Aug 1, 2024

Uncontrolled resource consumption in Cloudflare quiche 0.15.0 through 0.19.1 and 0.20.0 allows remote attackers to exhaust memory. Its post-handshake CRYPTO-frame handling repeatedly allocates memory without limiting the number of frames accepted during a connection. An unauthenticated peer must complete the QUIC handshake and keep the connection open while flooding 1-RTT CRYPTO frames, interrupting the client or server process.

CVSS severity5.9
Medium
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Cloudflare quiche 0.15.0 through 0.19.1 and 0.20.0 allows remote attackers to exhaust memory. Its post-handshake CRYPTO-frame handling repeatedly allocates memory without limiting the number of frames accepted during a connection. An unauthenticated peer must complete the QUIC handshake and keep the connection open while flooding 1-RTT CRYPTO frames, interrupting the client or server process.

The record

CVE
CVE-2024-1765
Published
Mar 12, 2024
Updated
Aug 1, 2024
Vendor
Cloudflare
Product
quiche
Classifications
CWE-770, CWE-400, CAPEC-272, CAPEC-130, CAPEC-125, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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=0.15.0 <=<0.19.1
  2. Affected versionversion=0.20.0 <<0.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloudflare · quicheversion=0.15.0 <=<0.19.1; version=0.20.0 <<0.20.1

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9CloudflareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
CAPEC-272Protocol Manipulation
CAPEC-130Excessive Allocation
CAPEC-125Flooding
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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