CVE-2025-6496

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 5.8% of scored records. A rank, not a probability.

NVD base score

1.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-06-23 00:00Z1 YR AGO

Last updated

2025-06-23 13:06Z1 YR AGO

Reserved

2025-06-22

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 4.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-404Improper Resource Shutdown or ReleaseClass
• CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

c8e5184fe1d3fbfe310e60088aeb7ea6d94050d7204897ebe0eeb56902aa7df9

• vuldb.comVDB-313612 | HTACG tidy-html5 parser.c InsertNodeAsParent null pointer dereferencehttps://vuldb.com/?id.313612vdb-entrytechnical-description
• vuldb.comVDB-313612 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/?ctiid.313612signaturepermissions-required
• vuldb.comSubmit #601007 | htacg tidy-html5 tidy-html5 5.8.0 (commit d08ddc2) NULL Pointer Dereferencehttps://vuldb.com/?submit.601007third-party-advisory
• github.comhttps://github.com/htacg/tidy-html5/issues/1141issue-tracking
• github.comhttps://github.com/user-attachments/files/19652942/tidy-html5_crash.txtexploit