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NVD / CVE Program· CNA f5

CVE-2026-63020: BIG-IP Configuration utility vulnerability

LowCVSS 2.3 · v4.0—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 9/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. Special conditions such as timing or configuration are required.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages  Impact: An attacker may trick authenticated BIG-IP users into accessing malicious links and reflect a spoofed error message in the victim's BIG-IP Configuration utility web browser session. This is a control plane issue; there is no data plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Published
Sep 2, 2026
Updated
Sep 15, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

9

Monitor

Low priority for now.

CVSS
9 / 40 · 2.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · f5
3.1
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-63020

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
f5big-ip access policy manager
f5big-ip advanced firewall manager
f5big-ip advanced web application firewall
f5big-ip analytics
f5big-ip application acceleration manager
f5big-ip application security manager
f5big-ip application visibility and reporting
f5big-ip automation toolchain
f5big-ip carrier-grade nat
f5big-ip container ingress services
f5big-ip ddos hybrid defender
f5big-ip domain name system

and 9 more

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 BIG-IP

    • 21.1.0 and later · before 21.1.0.1affected
    • 21.0.0 and later · before 21.0.0.3affected
    • 17.5.0 and later · before 17.5.1.8affected
    • 17.1.0 and later · before 17.1.3.4affected
Affected versions · NVD (20)

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

  • f5 big-ip access policy manager21.0.0 and later · up to 21.1.0 inclusive
  • f5 big-ip access policy manager17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip access policy manager17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip advanced firewall manager21.0.0 and later · up to 21.1.0 inclusive
  • f5 big-ip advanced firewall manager17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip advanced firewall manager17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip advanced web application firewall21.0.0 and later · up to 21.1.0 inclusive
  • f5 big-ip advanced web application firewall17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip advanced web application firewall17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip analytics21.0.0 and later · up to 21.1.0 inclusive
  • f5 big-ip analytics17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip analytics17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip application acceleration manager17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip application acceleration manager21.0.0 and later · up to 21.1.0 inclusive
  • f5 big-ip application acceleration manager17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip application security manager17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip application security manager17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip application security manager21.0.0 and later · up to 21.1.0 inclusive
  • f5 big-ip application visibility and reporting17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip application visibility and reporting17.5.0 and later · up to 17.5.1 inclusive

Same product

f5: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-1388On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 13.1.x versions prior…KEV
    99Now
  • CVE-2021-22986On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3…KEV
    99Now
  • CVE-2020-5902In BIG-IP versions 15.0.0-15.1.0.3, 14.1.0-14.1.2.5, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, the Traffic Management User…KEV
    99Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-42930May 13, 2026 · Appliance mode iControl REST vulnerability
    34Monitor
  • ← EarlierCVE-2026-42937May 13, 2026 · iControl REST and tmsh vulnerability
    28Monitor
  • Later →CVE-2026-94127Sep 22, 2026 · BIG-IP APM OAuth vulnerabilityKEV
    75This week

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).

Variant candidates

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

  • CVE-2026-20732210 days apartBIG-IP Configuration utility vulnerability
    9Monitor

Not on record for this CVE: patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-451 · User Interface (UI) Misrepresentation of Critical Information

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/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

nvd-secondary

Attack context

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

References

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

All records