NVD / CVE Program· CNA f5

CVE-2025-21087: When Client or Server SSL profiles are configured on a Virtual Server, or DNSSEC signing operations are in use, undisclosed traffic can caus

Noroxi assessment

Priority: Monitor (action score 35/100)

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: 0.40% (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.
Fixed version: F5 BIG-IP Hotfix-BIGIP-15.1.10.6.0.11.6-ENG.iso, Hotfix-BIGIP-16.1.5.2.0.7.5-ENG.iso.

Low priority for now. Upgrade to F5 BIG-IP Hotfix-BIGIP-15.1.10.6.0.11.6-ENG.iso, Hotfix-BIGIP-16.1.5.2.0.7.5-ENG.iso or later.

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 Client or Server SSL profiles are configured on a Virtual Server, or DNSSEC signing operations are in use, undisclosed traffic can cause an increase in memory and CPU resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

HighCVSS 8.9 · v4.0—No exploit Fix available

Published: Feb 5, 2025
Updated: Jun 17, 2026
EPSS: 0.4% · 34th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.9 / 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
A fix has been released

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

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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.

Vendor	Product	CPE
f5	big-ip access policy manager	cpe:2.3:a:f5:big-ip_access_policy_manager
f5	big-ip advanced firewall manager	cpe:2.3:a:f5:big-ip_advanced_firewall_manager
f5	big-ip advanced web application firewall	cpe:2.3:a:f5:big-ip_advanced_web_application_firewall
f5	big-ip analytics	cpe:2.3:a:f5:big-ip_analytics
f5	big-ip application acceleration manager	cpe:2.3:a:f5:big-ip_application_acceleration_manager
f5	big-ip application security manager	cpe:2.3:a:f5:big-ip_application_security_manager
f5	big-ip application visibility and reporting	cpe:2.3:a:f5:big-ip_application_visibility_and_reporting
f5	big-ip automation toolchain	cpe:2.3:a:f5:big-ip_automation_toolchain
f5	big-ip carrier-grade nat	cpe:2.3:a:f5:big-ip_carrier-grade_nat
f5	big-ip container ingress services	cpe:2.3:a:f5:big-ip_container_ingress_services
f5	big-ip ddos hybrid defender	cpe:2.3:a:f5:big-ip_ddos_hybrid_defender
f5	big-ip domain name system	cpe:2.3:a:f5:big-ip_domain_name_system

and 9 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 manager15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip access policy manager16.1.0 and later · before 16.1.6
f5 big-ip access policy manager17.1.0 and later · before 17.1.2
f5 big-ip advanced firewall manager16.1.0 and later · before 16.1.6
f5 big-ip advanced firewall manager17.1.0 and later · before 17.1.2
f5 big-ip advanced firewall manager15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip advanced web application firewall16.1.0 and later · before 16.1.6
f5 big-ip advanced web application firewall15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip advanced web application firewall17.1.0 and later · before 17.1.2
f5 big-ip analytics16.1.0 and later · before 16.1.6
f5 big-ip analytics15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip analytics17.1.0 and later · before 17.1.2
f5 big-ip application acceleration manager16.1.0 and later · before 16.1.6
f5 big-ip application acceleration manager15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip application acceleration manager17.1.0 and later · before 17.1.2
f5 big-ip application security manager16.1.0 and later · before 16.1.6
f5 big-ip application security manager15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip application security manager17.1.0 and later · before 17.1.2
f5 big-ip application visibility and reporting15.1.0 and later · up to 15.1.10 inclusive
f5 big-ip application visibility and reporting16.1.0 and later · before 16.1.6

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
- 17.1.0 and later · before 17.1.2affected
- 16.1.0 and lateraffectedfixed in Hotfix-BIGIP-16.1.5.2.0.7.5-ENG.iso
- 15.1.0 and lateraffectedfixed in Hotfix-BIGIP-15.1.10.6.0.11.6-ENG.iso
F5 BIG-IP Next
- 20.0.0 and later · before 20.1.0affected

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 InteKEV
99Now

Published before and after this one in the same product

← EarlierCVE-2025-20045Feb 5, 2025 · BIG-IP SIP MRF Vulnerability
34Monitor
← EarlierCVE-2025-20058Feb 5, 2025 · BIG-IP message routing vulnerability
35Monitor
Later →CVE-2025-21091Feb 5, 2025 · BIG-IP SNMP 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.

Product / package	Fixed version	Source
F5 BIG-IP	Hotfix-BIGIP-15.1.10.6.0.11.6-ENG.iso	Vendor (CNA)
F5 BIG-IP	Hotfix-BIGIP-16.1.5.2.0.7.5-ENG.iso	Vendor (CNA)

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.

F5finder

Variant candidates

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

CVE-2025-200580 days apartBIG-IP message routing vulnerability
35Monitor
CVE-2024-41727175 days apartBIG-IP TMM 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-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

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

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

my.f5.com/manage/s/article/K000134888

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

All records