CVE-2025-66570

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total 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

0.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 26.7% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. 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

2025-12-05 18:18Z10 MO AGO

Last updated

2025-12-05 18:40Z10 MO AGO

Reserved

2025-12-04

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Critical (CVSS 10.0)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Weaknesses

• CWE-290Authentication Bypass by SpoofingBase
• CWE-345Insufficient Verification of Data AuthenticityClass
• CWE-807Reliance on Untrusted Inputs in a Security DecisionBase

Data version

5.2

Document digest

89880f473374efcb0ac507d200197892c9959e7b4cceff12c7d7a96b7f0a6d86

• github.comhttps://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xm2j-vfr9-mg9mx_refsource_CONFIRM
• github.comhttps://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2affx_refsource_MISC