CVE-2025-8556

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.
• 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

0.53% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 44.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-27.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

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

2025-08-06 08:48Z1 YR AGO

Last updated

2026-10-27 05:42Z2 DAYS AGO

Reserved

2025-08-04

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Low (CVSS 3.7)

CNA CVSS vector

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

Weaknesses

• CWE-1287Improper Validation of Specified Type of InputBase

Data version

5.2

Document digest

8359a5414be2ac5d062bbf3c3f656122e34c7c78b372a586504388cfb2cd966e

• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2025-8556vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2371624https://bugzilla.redhat.com/show_bug.cgi?id=2371624issue-trackingx_refsource_REDHAT
• github.comhttps://github.com/cloudflare/circl
• github.comhttps://github.com/cloudflare/circl/security/advisories/GHSA-2x5j-vhc8-9cwm
• github.comhttps://github.com/cloudflare/circl/tree/v1.6.1
• www.botanica.softwarehttps://www.botanica.software/blog/cryptographic-issues-in-cloudflares-circl-fourq-implementation
• news.ycombinator.comhttps://news.ycombinator.com/item?id=45669593