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F5 BIG-IP DNS EUVDEUVD-2026-29959

| CVE-2026-28758 MEDIUM
Cleartext Storage of Sensitive Information (CWE-312)
2026-05-13 f5 GHSA-9657-qhh9-38mw
6.7
CVSS 4.0 · Vendor: f5
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Severity by source

Vendor (f5) PRIMARY
6.7 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (f5) · only source for this CVE.

CVSS VectorVendor: f5

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

3
CVSS changed
May 13, 2026 - 16:22 NVD
4.4 (MEDIUM) 6.7 (MEDIUM)
Analysis Generated
May 13, 2026 - 15:51 vuln.today
CVE Published
May 13, 2026 - 14:12 nvd
MEDIUM 4.4

DescriptionCVE.org

When BIG-IP DNS is provisioned, a vulnerability exists in the gtm_add and bigip_add iControl REST commands that return the ssh-password parameter in cleartext in the iControl REST response and is also logged in the audit log. This may allow a highly privileged, authenticated attacker with access to the audit log to view sensitive information.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

AnalysisAI

BIG-IP DNS provisioning exposes SSH passwords in cleartext within iControl REST API responses and audit logs when using the gtm_add and bigip_add commands, allowing highly privileged authenticated attackers with audit log access to retrieve sensitive credentials. The vulnerability affects all supported BIG-IP DNS versions and carries a CVSS score of 4.4 with low real-world exploitation risk due to the requirement for local access and high privilege level.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Compromise high-privilege admin account
Delivery
Access iControl REST API locally
Exploit
Execute gtm_add or bigip_add command
Execution
Retrieve ssh-password from cleartext response
Persist
Extract credentials from audit log
Impact
Use credentials for lateral movement

Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to possess highly privileged local administrator access to the BIG-IP DNS system (PR:H) AND the ability to query the iControl REST API or access the audit log on the local system (AV:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS vector indicates local attack vector (AV:L) with high privilege requirement (PR:H), meaning only highly privileged local administrators can trigger the vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A disgruntled highly privileged F5 administrator with legitimate access to the BIG-IP DNS system and its iControl REST API issues a gtm_add or bigip_add command, captures the API response containing the SSH password in plaintext, or reviews the audit log and extracts passwords that were logged in cleartext. The attacker then uses the recovered SSH credentials to access other systems or establish persistence. …
Remediation F5 has released a patch that addresses the cleartext exposure of SSH passwords in iControl REST responses and audit logs. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-29959 vulnerability details – vuln.today

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