Medium Info disclosure

CVE-2026-28758 — BIG-IP iControl REST vulnerability

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

Published May 13, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: f5

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.1% (30-day exploitation probability)+0
Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.11%

ahead of 1% of scored CVEs · Oct 14, 2026

Affects

BIG-IP and 1 more

CVSS base

4.4

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented mitigation — my.f5.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (F5 BIG-IP, F5 Big-ip Domain Name System).
Apply the documented mitigations until a definitive fix is available.
Search available logs for exploit probes matching the vulnerability class (info disclosure), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
F5	BIG-IP	≥ 17.5.0 and < 17.5.1.4≥ 17.1.0 and < 17.1.3.1≥ 16.1.0	Vulnerable	CVE Program (cve.org) e CISA ADP
F5	Big-ip Domain Name System	≥ 16.1.0 and ≤ 16.1.6≥ 17.1.0 and < 17.1.3.1≥ 17.5.0 and ≤ 17.5.1	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
6.7	CVSS 4.0	Medium	—	—	f5sirt@f5.com via NIST National Vulnerability Database
6.7	CVSS 4.0	Medium	—	—	f5 via CVE Program (cve.org) e CISA ADP
4.4	CVSS 3.1	Medium	0.8	3.6	f5sirt@f5.com via NIST National Vulnerability Database
4.4	CVSS 3.1	Medium	—	—	f5 via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N (score shown at the top: f5sirt@f5.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-312 · Cleartext Storage of Sensitive Information

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.11%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Look for anomalous data read/export volumes and access to sensitive records.

endpoint telemetry (EDR)application logsauthentication logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · f5/big-ip
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 4.4
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 13, 2026 · f5

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

my.f5.com/manage/s/article/K000158070
Mitigation, Vendor Advisory, vendor-advisory, patch, NIST National Vulnerability Database

Elsewhere on this site

F5
every CVE for this vendor

Info disclosure
same class

CWE-312
other pages naming this weakness

Related CVEs (same products)

Critical CVE-2026-94127 F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability KEV 23d
High CVE-2026-59762 BIG-IP HTTP/2 vulnerability Jul 15, 2026
Medium CVE-2026-42937 iControl REST and tmsh vulnerability May 13, 2026
High CVE-2026-42930 Appliance mode iControl REST vulnerability May 13, 2026
High CVE-2026-42920 BIG-IP DTLS Vulnerability May 13, 2026
High CVE-2026-42924 BIG-IP iControl SOAP vulnerability May 13, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-28758 is "BIG-IP iControl REST vulnerability", rated Medium. It affects BIG-IP (F5); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.4 describes technical severity. EPSS 0.11% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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