CVE-2025-63721

HIGHNVD 8.88.8—Elevated

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.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 30.1%
KEV: Not listed

Published

December 8, 2025

Last Modified

December 11, 2025

References (4)

cve@mitrehttps://gist.github.com/k1ng0fic3/e8c8c9353fff8fa95e2c2952587e9266
cve@mitrehttps://github.com/k1ng0fic3/secrisk/blob/main/README.md
134c704f-9b21-4f2e-91b3-4a467353bcc0https://gist.github.com/k1ng0fic3/e8c8c9353fff8fa95e2c2952587e9266
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/k1ng0fic3/secrisk/blob/main/README.md

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-502Deserialization of Untrusted Data

Data Freshness Timeline

(refreshed 14× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:46 UTCepss_batch
2026-06-05 22:46 UTCepss_batch
2026-06-05 06:10 UTCepss_batch
2026-06-05 06:10 UTCepss_batch
2026-06-04 13:12 UTCepss_batch
2026-06-04 13:12 UTCepss_batch
2026-06-02 20:13 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 18:13 UTCEG score recompute
2026-05-29 18:13 UTCGHSA enrichment
2026-05-29 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2025-63721?

CVE-2025-63721 is a high vulnerability published on December 8, 2025. 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.

When was CVE-2025-63721 disclosed?

CVE-2025-63721 was first published in the National Vulnerability Database on December 8, 2025, with the most recent update on December 11, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-63721 actively exploited?

CVE-2025-63721 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-63721?

CVE-2025-63721 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2025-63721?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-63721, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-63721

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-63721?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)