CVE-2023-34055Network attack vector

Denial of service via unbounded HTTP method tags

Published Nov 28, 2023 · Updated Feb 13, 2025

Denial of service in Spring Boot allows remote attackers to interrupt MVC or WebFlux applications via crafted HTTP methods. WebMvcTags and WebFluxTags used each raw, nonstandard HTTP method as a distinct Micrometer tag, allowing repeated requests to create unbounded tag values. Affected releases require spring-boot-actuator on the classpath; resource exhaustion disrupts availability without reading or changing data.

CVSS severity5.3
Medium
EPSS probability1.22%
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 Spring Boot allows remote attackers to interrupt MVC or WebFlux applications via crafted HTTP methods. WebMvcTags and WebFluxTags used each raw, nonstandard HTTP method as a distinct Micrometer tag, allowing repeated requests to create unbounded tag values. Affected releases require spring-boot-actuator on the classpath; resource exhaustion disrupts availability without reading or changing data.

The record

CVE
CVE-2023-34055
Published
Nov 28, 2023
Updated
Feb 13, 2025
Vendor
Spring
Product
Spring Boot
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=2.7.0 <2.7.18
  2. Affected versionversion=3.0.0 <3.0.13
  3. Affected versionversion=3.1.0 <3.1.6
  4. Affected versionversion=older unsupported versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring · Spring Bootversion=2.7.0 <2.7.18; version=3.0.0 <3.0.13; version=3.1.0 <3.1.6; version=older unsupported versions

Published CVSS scores

6.5Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.3SpringCVSS: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-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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