F5 BIG-IP Appliance Mode Vulnerability
Summary
| CVE | CVE-2026-42919 |
|---|---|
| State | PUBLISHED |
| Assigner | f5 |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-13 16:16:49 UTC |
| Updated | 2026-06-18 13:54:35 UTC |
| Description | A vulnerability exists in BIG-IP systems that may allow an authenticated attacker with administrative access to escalate their privileges. A successful exploit may allow the attacker to cross a security boundary. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. |
Risk And Classification
Primary CVSS: v4.0 7.1 HIGH from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/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
EPSS: 0.002880000 probability, percentile 0.202420000 (date 2026-06-21)
Problem Types: CWE-121 | CWE-121 CWE-121 Stack-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 7.1 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 7.1 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Secondary | 6.7 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H |
| 3.1 | CNA | CVSS | 6.7 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
HighUser Interaction
NoneConfidentiality
LowIntegrity
HighAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/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
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
HighUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | F5 | Big-ip Access Policy Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Access Policy Manager | All | All | All | All |
| Application | F5 | Big-ip Access Policy Manager | All | All | All | All |
| Application | F5 | Big-ip Access Policy Manager | All | All | All | All |
| Application | F5 | Big-ip Advanced Firewall Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Advanced Firewall Manager | All | All | All | All |
| Application | F5 | Big-ip Advanced Firewall Manager | All | All | All | All |
| Application | F5 | Big-ip Advanced Firewall Manager | All | All | All | All |
| Application | F5 | Big-ip Advanced Web Application Firewall | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Advanced Web Application Firewall | All | All | All | All |
| Application | F5 | Big-ip Advanced Web Application Firewall | All | All | All | All |
| Application | F5 | Big-ip Advanced Web Application Firewall | All | All | All | All |
| Application | F5 | Big-ip Analytics | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Analytics | All | All | All | All |
| Application | F5 | Big-ip Analytics | All | All | All | All |
| Application | F5 | Big-ip Analytics | All | All | All | All |
| Application | F5 | Big-ip Application Acceleration Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Application Acceleration Manager | All | All | All | All |
| Application | F5 | Big-ip Application Acceleration Manager | All | All | All | All |
| Application | F5 | Big-ip Application Acceleration Manager | All | All | All | All |
| Application | F5 | Big-ip Application Security Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Application Security Manager | All | All | All | All |
| Application | F5 | Big-ip Application Security Manager | All | All | All | All |
| Application | F5 | Big-ip Application Security Manager | All | All | All | All |
| Application | F5 | Big-ip Application Visibility And Reporting | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Application Visibility And Reporting | All | All | All | All |
| Application | F5 | Big-ip Application Visibility And Reporting | All | All | All | All |
| Application | F5 | Big-ip Application Visibility And Reporting | All | All | All | All |
| Application | F5 | Big-ip Automation Toolchain | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Automation Toolchain | All | All | All | All |
| Application | F5 | Big-ip Automation Toolchain | All | All | All | All |
| Application | F5 | Big-ip Automation Toolchain | All | All | All | All |
| Application | F5 | Big-ip Carrier-grade Nat | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Carrier-grade Nat | All | All | All | All |
| Application | F5 | Big-ip Carrier-grade Nat | All | All | All | All |
| Application | F5 | Big-ip Carrier-grade Nat | All | All | All | All |
| Application | F5 | Big-ip Container Ingress Services | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Container Ingress Services | All | All | All | All |
| Application | F5 | Big-ip Container Ingress Services | All | All | All | All |
| Application | F5 | Big-ip Container Ingress Services | All | All | All | All |
| Application | F5 | Big-ip Ddos Hybrid Defender | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Ddos Hybrid Defender | All | All | All | All |
| Application | F5 | Big-ip Ddos Hybrid Defender | All | All | All | All |
| Application | F5 | Big-ip Ddos Hybrid Defender | All | All | All | All |
| Application | F5 | Big-ip Domain Name System | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Domain Name System | All | All | All | All |
| Application | F5 | Big-ip Domain Name System | All | All | All | All |
| Application | F5 | Big-ip Domain Name System | All | All | All | All |
| Application | F5 | Big-ip Edge Gateway | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Edge Gateway | All | All | All | All |
| Application | F5 | Big-ip Edge Gateway | All | All | All | All |
| Application | F5 | Big-ip Edge Gateway | All | All | All | All |
| Application | F5 | Big-ip Fraud Protection Service | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Fraud Protection Service | All | All | All | All |
| Application | F5 | Big-ip Fraud Protection Service | All | All | All | All |
| Application | F5 | Big-ip Fraud Protection Service | All | All | All | All |
| Application | F5 | Big-ip Global Traffic Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Global Traffic Manager | All | All | All | All |
| Application | F5 | Big-ip Global Traffic Manager | All | All | All | All |
| Application | F5 | Big-ip Global Traffic Manager | All | All | All | All |
| Application | F5 | Big-ip Link Controller | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Link Controller | All | All | All | All |
| Application | F5 | Big-ip Link Controller | All | All | All | All |
| Application | F5 | Big-ip Link Controller | All | All | All | All |
| Application | F5 | Big-ip Local Traffic Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Local Traffic Manager | All | All | All | All |
| Application | F5 | Big-ip Local Traffic Manager | All | All | All | All |
| Application | F5 | Big-ip Local Traffic Manager | All | All | All | All |
| Application | F5 | Big-ip Policy Enforcement Manager | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Policy Enforcement Manager | All | All | All | All |
| Application | F5 | Big-ip Policy Enforcement Manager | All | All | All | All |
| Application | F5 | Big-ip Policy Enforcement Manager | All | All | All | All |
| Application | F5 | Big-ip Ssl Orchestrator | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Ssl Orchestrator | All | All | All | All |
| Application | F5 | Big-ip Ssl Orchestrator | All | All | All | All |
| Application | F5 | Big-ip Ssl Orchestrator | All | All | All | All |
| Application | F5 | Big-ip Webaccelerator | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Webaccelerator | All | All | All | All |
| Application | F5 | Big-ip Webaccelerator | All | All | All | All |
| Application | F5 | Big-ip Webaccelerator | All | All | All | All |
| Application | F5 | Big-ip Websafe | 21.0.0 | All | All | All |
| Application | F5 | Big-ip Websafe | All | All | All | All |
| Application | F5 | Big-ip Websafe | All | All | All | All |
| Application | F5 | Big-ip Websafe | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | F5 | BIG-IP | unaffected 21.1.0 * custom | Not specified |
| CNA | F5 | BIG-IP | affected 21.0.0 21.0.0.1 custom | Not specified |
| CNA | F5 | BIG-IP | affected 17.5.0 17.5.1.4 custom | Not specified |
| CNA | F5 | BIG-IP | affected 17.1.0 17.1.3.1 custom | Not specified |
| CNA | F5 | BIG-IP | affected 16.1.0 * custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| my.f5.com/manage/s/article/K000158971 | [email protected] | my.f5.com | Mitigation, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: F5 (en)
There are currently no legacy QID mappings associated with this CVE.