CVE-2025-26466

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

38.68% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 98.5% of scored records. A rank, not a probability.

NVD base score

5.9 (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:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-21.

Red Hat severity

Moderate. 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

2025-02-28 21:25Z1 YR AGO

Last updated

2026-10-21 16:55Z8 DAYS AGO

Reserved

2025-02-10

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

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

Weaknesses

• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

9f6385b664a5dd3527a49c991331700fced09bfb3740e0a09e413a4b12ae9455

• access.redhat.comRHBA-2025:6305https://access.redhat.com/errata/RHBA-2025:6305vendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2025:6993https://access.redhat.com/errata/RHSA-2025:6993vendor-advisoryx_refsource_REDHAT
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2025-26466vdb-entryx_refsource_REDHAT
• bugzilla.redhat.comRHBZ#2345043https://bugzilla.redhat.com/show_bug.cgi?id=2345043issue-trackingx_refsource_REDHAT
• seclists.orghttps://seclists.org/oss-sec/2025/q1/144
• www.qualys.comhttps://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20250228-0002/
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2025/02/18/1
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2025/02/18/4
• bugzilla.suse.comhttps://bugzilla.suse.com/show_bug.cgi?id=1237041
• security-tracker.debian.orghttps://security-tracker.debian.org/tracker/CVE-2025-26466
• ubuntu.comhttps://ubuntu.com/security/CVE-2025-26466
• seclists.orghttp://seclists.org/fulldisclosure/2025/May/8
• seclists.orghttp://seclists.org/fulldisclosure/2025/May/7
• seclists.orghttp://seclists.org/fulldisclosure/2025/Feb/18
• www.vicarius.iohttps://www.vicarius.io/vsociety/posts/cve-2025-26466-detection-script-memory-consumption-vulnerability-in-openssh
• www.vicarius.iohttps://www.vicarius.io/vsociety/posts/cve-2025-26466-mitigation-script-memory-consumption-vulnerability-in-openssh
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html