CVE-2023-54365Network attack vector

Service interruption via rapid HTTP/2 stream resets

Published Jun 23, 2026 · Updated Jun 23, 2026

Denial of service in Traefik Proxy before 2.10.5 and 3.0.0-beta4 allows remote attackers to interrupt service via HTTP/2 requests. Its inherited Go HTTP/2 handler processes streams that a client opens and immediately cancels without limiting the resulting per-connection work. A network client that can negotiate HTTP/2 with an exposed entry point can repeat the reset sequence to exhaust resources and make routed services unavailable.

CVSS severity8.7
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Traefik Proxy before 2.10.5 and 3.0.0-beta4 allows remote attackers to interrupt service via HTTP/2 requests. Its inherited Go HTTP/2 handler processes streams that a client opens and immediately cancels without limiting the resulting per-connection work. A network client that can negotiate HTTP/2 with an exposed entry point can repeat the reset sequence to exhaust resources and make routed services unavailable.

The record

CVE
CVE-2023-54365
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Traefik Labs
Product
Traefik Proxy
Classifications
CWE-400, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2026Record 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 <2.10.5
  2. Affected versionversion=3.0.0-beta1 <3.0.0-beta4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Traefik Labs · Traefik Proxyversion=0 <2.10.5; version=3.0.0-beta1 <3.0.0-beta4

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/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-400Uncontrolled Resource Consumption
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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