# CVE-2023-34055: Spring Boot server Web Observations DoS Vulnerability

> Attackers can cause denial of service in Spring Boot applications using MVC or WebFlux with Actuator via crafted HTTP requests.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Nov 2023
- **Updated:** 13 Feb 2025
- **Also known as:** CLSA-2026-1769472532, CLSA-2026-1776040413, GHSA-jjfh-589g-3hjx

## What is CVE-2023-34055?

CVE-2023-34055 is a medium-severity denial of service vulnerability in Spring Boot, published on 28 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In Spring Boot versions 2.7.0 - 2.7.17, 3.0.0-3.0.12 and 3.1.0-3.1.5, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition.

Specifically, an application is vulnerable when all of the following are true:

  *  the application uses Spring MVC or Spring WebFlux
  *  org.springframework.boot:spring-boot-actuator is on the classpath

## Which versions are affected by CVE-2023-34055?

6 open source packages ship an affected version, including org.springframework.boot:spring-boot-actuator. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.springframework.boot:spring-boot-actuator` | Maven | All versions | 2.7.18 |
| `org.springframework.boot:spring-boot-actuator` | Maven | All versions | 2.7.18 |
| `org.springframework.boot:spring-boot-actuator` | Maven | From 3.0.0 | 3.0.13 |
| `org.springframework.boot:spring-boot-actuator` | Maven | From 3.0.0 | 3.0.13 |
| `org.springframework.boot:spring-boot-actuator` | Maven | From 3.1.0 | 3.1.6 |
| `org.springframework.boot:spring-boot-actuator` | Maven | From 3.1.0 | 3.1.6 |

Products: Vmware Spring Boot.

## How do I fix CVE-2023-34055?

Upgrade org.springframework.boot:spring-boot-actuator to a fixed version for your release line: 2.7.18, 3.0.13 or 3.1.6.

## Is CVE-2023-34055 being exploited?

There is no known exploitation of CVE-2023-34055 in the wild and no public exploit code.

## Other vulnerabilities in Spring Boot

- [CVE-2023-20873](https://insights.sbomify.com/CVE-2023-20873/): Spring Boot Security Bypass with Wildcard Pattern Matching on Cloud Foundry (critical 9.8)
- [CVE-2026-40976](https://insights.sbomify.com/CVE-2026-40976/): Spring Boot's default security filter chain has no authorization rule with Actuator but without Health (critical 9.1)
- [CVE-2026-22731](https://insights.sbomify.com/CVE-2026-22731/): Authentication Bypass under Actuator Health groups paths (high 8.2)
- [CVE-2026-22733](https://insights.sbomify.com/CVE-2026-22733/): Authentication Bypass under Actuator CloudFoundry endpoints (high 8.2)
- [CVE-2022-27772](https://insights.sbomify.com/CVE-2022-27772/): Temporary Directory Hijacking to Local Privilege Escalation Vulnerability in org.springframework.boot:spring-boot (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-34055 and fix it if it is affected.

What it is: CVE-2023-34055 is a medium-severity denial of service vulnerability in Spring Boot, published on 28 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-34055 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.springframework.boot:spring-boot-actuator (Maven): affected all versions; fixed in 2.7.18
- org.springframework.boot:spring-boot-actuator (Maven): affected all versions; fixed in 2.7.18
- org.springframework.boot:spring-boot-actuator (Maven): affected from 3.0.0; fixed in 3.0.13
- org.springframework.boot:spring-boot-actuator (Maven): affected from 3.0.0; fixed in 3.0.13
- org.springframework.boot:spring-boot-actuator (Maven): affected from 3.1.0; fixed in 3.1.6
- org.springframework.boot:spring-boot-actuator (Maven): affected from 3.1.0; fixed in 3.1.6

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-34055/ (Markdown: https://insights.sbomify.com/CVE-2023-34055/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-34055
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-34055
- OSV: https://osv.dev/vulnerability/CVE-2023-34055

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-34055/
Summaries are generated and may contain mistakes; the official description above is the record.