CVE-2025-63721: HummerRisk thru v1.5.0 is using a vulnerable Snakeyaml component, allowing attackers with normal user privileg

Q: How do I fix CVE-2025-63721?

hummerrisk: upgrade to newer than 1.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-63721 being exploited?

CVE-2025-63721 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-63721 affect?

CVE-2025-63721 affects hummerrisk. Severity is high (CVSS 8.8). HummerRisk thru v1.5.0 is using a vulnerable Snakeyaml component, allowing attackers with normal user privileges to hit the /rule/add API and thereby achieve RCE and take over the server.

Q: How urgent is CVE-2025-63721?

Priority 46/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2025-63721 is a high-severity flaw (CVSS 8.8) affecting hummerrisk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HummerRisk thru v1.5.0 is using a vulnerable Snakeyaml component, allowing attackers with normal user privileges to hit the /rule/add API and thereby achieve RCE and take over the server.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-502
Published	2025-12-08
Last modified	2026-10-15

Publisher (CNA): MITRE · Vendor: hummerrisk

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-08 17:16 UTCPublished CVE record published
2026-10-15 20:10 UTCUpdated Record last modified

hummerrisk hummerrisk UPGRADE

Affected: <= 1.5.0

Fixed in: newer than 1.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.5.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hummerrisk

Note

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

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-2025-63721?

hummerrisk: upgrade to newer than 1.5.0. Exact commands for each OS are on this page.

Is CVE-2025-63721 being exploited?

CVE-2025-63721 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-2025-63721 affect?

CVE-2025-63721 affects hummerrisk. Severity is high (CVSS 8.8). HummerRisk thru v1.5.0 is using a vulnerable Snakeyaml component, allowing attackers with normal user privileges to hit the /rule/add API and thereby achieve RCE and take over the server.

How urgent is CVE-2025-63721?

Priority 46/100. High severity; Public exploit reference

Related CVEs

CVE-2026-3067 MEDIUM 6.3 UPGRADE A vulnerability has been found in HummerRisk up to 1.5.0
CVE-2026-3066 MEDIUM 6.3 UPGRADE A flaw has been found in HummerRisk up to 1.5.0
CVE-2026-3065 MEDIUM 6.3 UPGRADE A vulnerability was detected in HummerRisk up to 1.5.0
CVE-2026-3064 MEDIUM 6.3 UPGRADE A security vulnerability has been detected in HummerRisk up to 1.5.0

References

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