CVE-2025-30373: Graylog is a free and open log management platform

Routine

MEDIUM 6.5REMOTEUPGRADE

CVE-2025-30373 is a medium-severity flaw (CVSS 6.5) affecting graylog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Graylog is a free and open log management platform. Starting with 6.1, HTTP Inputs can be configured to check if a specified header is present and has a specified value to authenticate HTTP-based ingestion. Unfortunately, even though in cases of a missing header or a wrong value the correct HTTP response (401) is returned, the message will be ingested nonetheless. To mitigate the vulnerability, disable http-based inputs and allow only authenticat

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-285
Published	2025-04-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: graylog

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-07 15:15 UTCPublished CVE record published
2026-06-17 09:08 UTCUpdated Record last modified

graylog graylog UPGRADE

Affected: >= 6.1.0 and < 6.1.9

Fixed in: 6.1.9

Safe to downgrade to: a release before 6.1.0

1. Check installed version

apt-cache policy graylog || rpm -q graylog || graylog --version

2. UPGRADE to 6.1.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade graylog

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade graylog

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.1.0 (Debian / Ubuntu)

apt-cache madison graylog sudo apt install graylog=<VERSION_BEFORE_6.1.0> sudo apt-mark hold graylog

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list graylog sudo dnf downgrade graylog-<VERSION_BEFORE_6.1.0> sudo dnf versionlock add graylog

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-30373?

graylog: upgrade to 6.1.9. Exact commands for each OS are on this page.

Is CVE-2025-30373 being exploited?

CVE-2025-30373 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-30373 affect?

CVE-2025-30373 affects graylog. Severity is medium (CVSS 6.5). Graylog is a free and open log management platform. Starting with 6.1, HTTP Inputs can be configured to check if a specified header is present and has a specified value to authenticate HTTP-based ingestion. Unfortunately, even though in cas

How urgent is CVE-2025-30373?

Priority 34/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-1441 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1440 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1439 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1438 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1437 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused

References

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