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CVE-2018-15321· NVD / CVE Program· CNA f5

When BIG-IP 14.0.0-14.0.0.2, 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.2.1-11.5.6, BIG-IQ Centralized Management 5.0.0-5.4.0

When BIG-IP 14.0.0-14.0.0.2, 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.2.1-11.5.6, BIG-IQ Centralized Management 5.0.0-5.4.0 or 4.6.0, BIG-IQ Cloud and Orchestration 1.0.0, iWorkflow 2.1.0-2.3.0, or Enterprise Manager 3.1.1 is licensed for Appliance Mode, Admin and Resource administrator roles can by-pass BIG-IP Appliance Mode restrictions to overwrite critical system files. Attackers of high privilege level are able to overwrite critical system files which bypasses security controls in place to limit TMSH commands. This is possible with an administrator or resource administrator roles when granted TMSH. Resource administrator roles must have TMSH access in order to perform this attack.

MediumCVSS 4.9 · v3.0—No exploit No fix recorded
Published
Oct 31, 2018
Updated
Jun 16, 2026
EPSS
0.9% · 58th percentile
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JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

Affected systems

VendorProduct
f5big-ip local traffic manager
f5big-ip advanced firewall manager
f5big-ip application acceleration manager
f5big-ip analytics
f5big-ip access policy manager
f5big-ip protocol security module
f5big-ip domain name system
f5big-ip edge gateway
f5big-ip fraud protection service
f5big-ip global traffic manager
f5big-ip link controller
f5big-ip policy enforcement manager

and 5 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • f5 big-ip access policy manager11.2.1 and later · up to 11.5.6 inclusive
  • f5 big-ip access policy manager14.0.0 and later · up to 14.0.0.2 inclusive
  • f5 big-ip access policy manager13.0.0 and later · up to 13.1.0.7 inclusive
  • f5 big-ip access policy manager12.1.0 and later · up to 12.1.3.5 inclusive
  • f5 big-ip access policy manager11.6.0 and later · up to 11.6.3.2 inclusive
  • f5 big-ip advanced firewall manager11.2.1 and later · up to 11.5.6 inclusive
  • f5 big-ip advanced firewall manager11.6.0 and later · up to 11.6.3.2 inclusive
  • f5 big-ip advanced firewall manager12.1.0 and later · up to 12.1.3.5 inclusive
  • f5 big-ip advanced firewall manager13.0.0 and later · up to 13.1.0.7 inclusive
  • f5 big-ip advanced firewall manager14.0.0 and later · up to 14.0.0.2 inclusive
  • f5 big-ip analytics14.0.0 and later · up to 14.0.0.2 inclusive
  • f5 big-ip analytics11.2.1 and later · up to 11.5.6 inclusive
  • f5 big-ip analytics11.6.0 and later · up to 11.6.3.2 inclusive
  • f5 big-ip analytics12.1.0 and later · up to 12.1.3.5 inclusive
  • f5 big-ip analytics13.0.0 and later · up to 13.1.0.7 inclusive
  • f5 big-ip application acceleration manager11.2.1 and later · up to 11.5.6 inclusive
  • f5 big-ip application acceleration manager11.6.0 and later · up to 11.6.3.2 inclusive
  • f5 big-ip application acceleration manager12.1.0 and later · up to 12.1.3.5 inclusive
  • f5 big-ip application acceleration manager13.0.0 and later · up to 13.1.0.7 inclusive
  • f5 big-ip application acceleration manager14.0.0 and later · up to 14.0.0.2 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (f5). Independent of NVD's CPE analysis and usually ahead of it.

  • F5 Networks, Inc. BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, Edge Gateway, FPS, GTM, Link Controller, PEM, WebAccelerator), BIG-IQ Centralized Management, BIG-IQ Cloud and Orchestration, iWorkflow, Enterprise Man

    • 14.0.0-14.0.0.2, 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, 11.2.1-11.5.6affected

Same product

f5: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-9244A BIG-IP virtual server configured with a Client SSL profile that has the non-default Session Tickets option enabled may leak up to 31 bytes
    52Plan
  • CVE-2016-5745F5 BIG-IP LTM systems 11.x before 11.2.1 HF16, 11.3.x, 11.4.x before 11.4.1 HF11, 11.5.0, 11.5.1 before HF11, 11.5.2, 11.5.3, 11.5.4 before
    40Plan
  • CVE-2019-6609Platform dependent weakness.
    39Monitor
  • CVE-2018-5506In F5 BIG-IP 13.0.0, 12.1.0-12.1.2, 11.6.1, 11.5.1-11.5.5, or 11.2.1 the Apache modules apache_auth_token_mod and mod_auth_f5_auth_token.cpp
    39Monitor
  • CVE-2017-6131In some circumstances, an F5 BIG-IP version 12.0.0 to 12.1.2 and 13.0.0 Azure cloud instance may contain a default administrative password w
    39Monitor
  • CVE-2019-6644Similar to the issue identified in CVE-2018-12120, on versions 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.2, and 12.1.0-12.1.4 BIG-IP wil
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Root cause

To simplify setup, a service account is granted broad, cluster-wide permissions. The principle of least privilege is skipped during installation.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

yaml
kind: ClusterRolerules:  - apiGroups: ["*"]    resources: ["*"]    verbs: ["*"]

Fixed

yaml
kind: Rolemetadata:  namespace: lodos-systemrules:  - apiGroups: ["apps"]    resources: ["deployments"]    verbs: ["get", "list", "update"]

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records