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Openssh CVE-2025-26465

MEDIUM
Detection of Error Condition Without Action (CWE-390)
2025-02-18 secalert@redhat.com
Information Disclosure SSH Debian Red Hat Active Iq Unified Manager Debian Linux Enterprise Linux Ontap Openshift Container Platform Openssh Openbsd Netapp
6.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-390
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Error detection with action
Impact

CVSS score of 6.8 (MEDIUM). Attack characteristics: network attack vector, high complexity, no privileges required, user interaction required. EPSS exploitation probability: 59.97%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 60.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. Rated medium severity (CVSS 6.8), this vulnerability is remotely exploitable, no authentication required. Epss exploitation probability 60.0%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-390. A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high. Affected products include: Openbsd Openssh, Netapp Active Iq Unified Manager, Netapp Ontap, Redhat Openshift Container Platform, Debian Debian Linux.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 6.8 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
SUSE MEDIUM
Red Hat 6.8 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

2
Patch released
Mar 28, 2026 - 18:27 nvd
Patch available
CVE Published
Feb 18, 2025 - 19:15 nvd
MEDIUM 6.8

DescriptionNVD

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.

Executive ViewAI

Why It Matters

Organizations using A vulnerability should be aware of notable risk from CVE-2025-26465 rated CVSS 6.8. Exploitation could compromise the security of affected deployments. With an EPSS score of 60%, this vulnerability has elevated exploitation probability. A patch is available and should be applied during regular vulnerability management.

Business Impact: High
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

Threat Score
5.2/10
Composite threat intelligence
EPSS Score
60.0%
Top 2% exploitable
Threat Intel
1
1 source
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS CISA Vendor

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 60.0%
Patch available Yes
Active threat Yes
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
High

Priority Score

104
Low Medium High Critical
KEV: 0
EPSS: +60
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: +10
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.8:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

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Same weakness CWE-390 – Detection of Error Condition Without Action

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Same technique Information Disclosure

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CVE-2025-68613 HIGH POC
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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/git:2 Affected
Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.7.20.5.1 Image SLES15-SP6 Image SLES15-SP6-Azure-3P Image SLES15-SP6-Azure-Basic Image SLES15-SP6-Azure-Standard Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-HPC Image SLES15-SP6-HPC-Azure Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-Azure-3P Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-BYOS-Azure Image SLES15-SP6-SAP-Hardened-Azure Image SLES15-SP6-SAP-Hardened-BYOS-Azure Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-HPC-Azure Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAPCAL-Azure Affected
Container suse/manager/4.3/proxy-ssh:4.3.14.9.50.19 Affected
Container suse/manager/5.0/x86_64/proxy-ssh:5.0.4.7.14.1 Container suse/manager/5.0/x86_64/server:5.0.4.7.19.1 Container suse/multi-linux-manager/5.1/x86_64/proxy-ssh:5.1.0.6.20 Container suse/multi-linux-manager/5.1/x86_64/server:5.1.0.6.40 Image proxy-ssh-image Image server-image Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.6 Container suse/sl-micro/6.1/baremetal-os-container:2.2.0-4.5 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-Base Image SL-Micro-Base-RT Image SL-Micro-Base-RT-SelfInstall Image SL-Micro-Base-RT-encrypted Image SL-Micro-Base-SelfInstall Image SL-Micro-Base-encrypted Image SL-Micro-Base-qcow Image SL-Micro-Default Image SL-Micro-Default-SelfInstall Image SL-Micro-Default-encrypted Image SL-Micro-Default-qcow Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected

Threat IntelligenceMISP

CISA Advisories
ICSA-26-202-04
Sources: CISA (public domain)

References

Advisories & patches
PATCH https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:0585/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:0605/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:0659/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:0744/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:14820/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:20160/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:20226/ REF http://seclists.org/fulldisclosure/2025/Feb/18 REF http://seclists.org/fulldisclosure/2025/May/7 REF http://seclists.org/fulldisclosure/2025/May/8 REF https://access.redhat.com/errata/RHSA-2025:16823 REF https://access.redhat.com/errata/RHSA-2025:3837 REF https://access.redhat.com/errata/RHSA-2025:6993 REF https://access.redhat.com/errata/RHSA-2025:8385 REF https://access.redhat.com/security/cve/CVE-2025-26465 REF https://access.redhat.com/solutions/7109879 REF https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466 REF https://bugzilla.redhat.com/show_bug.cgi?id=2344780 REF https://bugzilla.suse.com/show_bug.cgi?id=1237040 REF https://cert-portal.siemens.com/productcert/html/ssa-082556.html REF https://cert-portal.siemens.com/productcert/html/ssa-585531.html REF https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html REF https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html REF https://seclists.org/oss-sec/2025/q1/144 REF https://security-tracker.debian.org/tracker/CVE-2025-26465 REF https://security.netapp.com/advisory/ntap-20250228-0003/ REF https://ubuntu.com/security/CVE-2025-26465 REF https://www.openssh.com/releasenotes.html#9.9p2 REF https://www.openwall.com/lists/oss-security/2025/02/18/1 REF https://www.openwall.com/lists/oss-security/2025/02/18/4 REF https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/ REF https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh REF https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh

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