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CVE-2026-42409· NVD / CVE Program· CNA f5

BIG-IP HTTP/2 vulnerability

Noroxi assessment

Priority: Monitor (action score 34/100)

  • 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: 0.46% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • 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

When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

HighCVSS 8.7 · v4.0—No exploit No fix recorded
Published
May 13, 2026
Updated
Jun 23, 2026
EPSS
0.4% · 38th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · f5
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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

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-2026-42409

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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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 next cloud-native network functions
f5big-ip next for kubernetes
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

and 11 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 manager17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip access policy manager16.1.0 and later · up to 16.1.6 inclusive
  • f5 big-ip access policy manager17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip access policy manager21.0.0
  • 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 firewall manager16.1.0 and later · up to 16.1.6 inclusive
  • f5 big-ip advanced firewall manager21.0.0
  • f5 big-ip advanced web application firewall17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip advanced web application firewall16.1.0 and later · up to 16.1.6 inclusive
  • f5 big-ip advanced web application firewall17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip advanced web application firewall21.0.0
  • f5 big-ip analytics16.1.0 and later · up to 16.1.6 inclusive
  • f5 big-ip analytics17.5.0 and later · up to 17.5.1 inclusive
  • f5 big-ip analytics17.1.0 and later · up to 17.1.3 inclusive
  • f5 big-ip analytics21.0.0
  • f5 big-ip application acceleration manager16.1.0 and later · up to 16.1.6 inclusive
  • f5 big-ip application acceleration manager17.5.0 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

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 laternot affected
    • 21.0.0 and later · before 21.0.0.1affected
    • 17.5.0 and later · before 17.5.1.4affected
    • 17.1.0 and later · before 17.1.3.1affected
    • 16.1.0 and lateraffected

  • F5 BIG-IP Next CNF

    • 2.0.0 and later · before 2.0.3affected
    • 1.4.0 and later · before 1.4.1affected

  • F5 BIG-IP Next for Kubernetes

    • 2.0.0 and later · before 2.1.1affected

  • F5 BIG-IP Next SPK

    • 2.0.0 and later · before 2.0.3affected
    • 1.7.0 and later · before 1.7.17affected

Same product

f5: all records

Other highest-scoring records for the same primary product.

Published before and after this one in the same product

  • ← EarlierCVE-2025-54805Oct 15, 2025 · When an iRule is configured on a virtual server via the declarative API, upon re-instantiation, the cleanup process can cause an increase in
    24Monitor
  • ← EarlierCVE-2025-55670Oct 15, 2025 · BIG-IP Next (CNF, SPK, and Kubernetes) vulnerability
    28Monitor
  • ← EarlierCVE-2025-58120Oct 15, 2025 · BIG-IP Next (CNF, SPK, and Kubernetes) vulnerability
    34Monitor

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.

Credits

All researchers

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

Variant candidates

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

  • CVE-2025-58120210 days apartBIG-IP Next (CNF, SPK, and Kubernetes) vulnerability
    34Monitor

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.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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