CVE-2025-23016

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 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

0.58% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 45.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2025-01-10 00:00Z1 YR AGO

Last updated

2026-02-26 19:09Z6 MO AGO

Reserved

2025-01-10

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

• CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

752c2d75afae7e7e971f1d7c15055ad186d4baf839031f47f6cb7d9e57233cb5

• github.comhttps://github.com/FastCGI-Archives/fcgi2/issues/67
• github.comhttps://github.com/FastCGI-Archives/fcgi2/releases/tag/2.4.5
• www.synacktiv.comhttps://www.synacktiv.com/en/publications/cve-2025-23016-exploiting-the-fastcgi-library
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/04/23/4
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/10/msg00009.html