# CVE-2025-34271: Nagios Log Server < 2024R2.0.2 Cluster Manager Credential Requests Sent Over Plaintext

> Attackers can intercept cluster manager credentials sent over plaintext, enabling unauthorized access and lateral movement in Nagios Log Server.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Oct 2025
- **Updated:** 17 Nov 2025
- **Also known as:** GHSA-3wc8-676p-crj6

## What is CVE-2025-34271?

CVE-2025-34271 is a high-severity vulnerability in Nagios Log Server, published on 30 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Nagios Log Server versions prior to 2024R2.0.2 contain a vulnerability in the cluster manager component when requesting sensitive credentials from peer nodes over an unencrypted channel even when SSL/TLS is enabled in the product configuration. As a result, an attacker positioned on the network path can intercept credentials in transit. Captured credentials could allow the attacker to authenticate as a cluster node or service account, enabling further unauthorized access, lateral movement, or system compromise.

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2025-34271?

It affects 1 product.


Products: Nagios Log Server.

## How do I fix CVE-2025-34271?

No fix has been published for CVE-2025-34271 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34271 being exploited?

There is no known exploitation of CVE-2025-34271 in the wild and no public exploit code.

## Other vulnerabilities in Nagios Log Server

- [CVE-2025-44823](https://insights.sbomify.com/CVE-2025-44823/): Information disclosure in Log Server (critical 9.9)
- [CVE-2025-34277](https://insights.sbomify.com/CVE-2025-34277/): Nagios Log Server < 2024R1.3.1 RCE via Malformed Dashboard ID (critical 9.4)
- [CVE-2025-34274](https://insights.sbomify.com/CVE-2025-34274/): Nagios Log Server < 2024R2.0.3 Logstash Process Root Privileges (critical 9.3)
- [CVE-2023-7322](https://insights.sbomify.com/CVE-2023-7322/): Nagios Log Server < 2024R1 Incorrect Authorization Granting Full API Access (high 8.7)
- [CVE-2025-34298](https://insights.sbomify.com/CVE-2025-34298/): Nagios Log Server < 2024R1.3.2 Set Email Privilege Escalation (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34271 and fix it if it is affected.

What it is: CVE-2025-34271 is a high-severity vulnerability in Nagios Log Server, published on 30 Oct 2025. 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-2025-34271 in the wild and no public exploit code.

Affected product: Nagios Log Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2025-34271/ (Markdown: https://insights.sbomify.com/CVE-2025-34271/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34271
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34271
- OSV: https://osv.dev/vulnerability/CVE-2025-34271

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34271/
Summaries are generated and may contain mistakes; the official description above is the record.