CVE-2024-34362Public exploitNetwork attack vector

Remote crash via dangling QUIC response encoder

Published Jun 4, 2024 · Updated Aug 19, 2024

Use-after-free in affected Envoy releases allows remote attackers to crash the proxy through a crafted HTTP/3 stream sequence. EnvoyQuicServerStream omits reset callbacks after RESET_STREAM without STOP_SENDING, leaving HCM's ActiveStream referencing a destroyed QUIC stream as its response encoder. An unauthenticated HTTP/3 downstream client must leave the request open, reset the stream, receive the reply, and then close the connection; the resulting stale encoder access crashes the Envoy process.

CVSS severity5.9
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Envoy releases allows remote attackers to crash the proxy through a crafted HTTP/3 stream sequence. EnvoyQuicServerStream omits reset callbacks after RESET_STREAM without STOP_SENDING, leaving HCM's ActiveStream referencing a destroyed QUIC stream as its response encoder. An unauthenticated HTTP/3 downstream client must leave the request open, reset the stream, receive the reply, and then close the connection; the resulting stale encoder access crashes the Envoy process.

The record

CVE
CVE-2024-34362
Published
Jun 4, 2024
Updated
Aug 19, 2024
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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 <1.27.6
  2. Affected versionversion=<= 1.27.5
  3. Affected versionversion=>= 1.28.0, <= 1.28.3
  4. Affected versionversion=1.28.0 <1.28.4
  5. Affected versionversion=>= 1.29.0, <= 1.29.4
  6. Affected versionversion=1.29.0 <1.29.5
  7. Affected versionversion=>= 1.30.0, <= 11.30.1
  8. Affected versionversion=1.30.0 <1.30.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=0 <1.27.6; version=<= 1.27.5; version=>= 1.28.0, <= 1.28.3; version=1.28.0 <1.28.4; version=>= 1.29.0, <= 1.29.4; version=1.29.0 <1.29.5; version=>= 1.30.0, <= 11.30.1; version=1.30.0 <1.30.2

Published CVSS scores

5.9GitHubCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

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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