CVE-2025-59781: BIG-IP DNS cache vulnerability
Published Oct 15, 2025
·Updated
When DNS cache is configured on a BIG-IP or BIG-IP Next CNF virtual server, undisclosed DNS queries can cause an increase in memory resource utilization.
Affected Software
69 affected componentsFixes available
F5 BIG-IP Next CNF
F5 BIG-IP Next CNF>=1.1.0<=1.4.0
1.4.0
F5 BIG-IP>=17.1.0<=17.1.2
17.1.2.2
F5 BIG-IP>=16.1.0<=16.1.5
16.1.6
F5 BIG-IP>=15.1.0<=15.1.10
15.1.10.8
F5 BIG-IP Access Policy Manager>=15.1.0<15.1.10.8
F5 BIG-IP Advanced Firewall Manager>=15.1.0<15.1.10.8
F5 Big-ip Advanced Web Application Firewall>=15.1.0<15.1.10.8
F5 BIG-IP Analytics>=15.1.0<15.1.10.8
F5 Big-ip Application Acceleration Manager>=15.1.0<15.1.10.8
F5 BIG-IP Application Security Manager>=15.1.0<15.1.10.8
F5 Big-ip Application Visibility And Reporting>=15.1.0<15.1.10.8
F5 Big-ip Automation Toolchain>=15.1.0<15.1.10.8
F5 Big-ip Carrier-grade Nat>=15.1.0<15.1.10.8
F5 BIG-IP Container Ingress Services>=15.1.0<15.1.10.8
F5 Big-ip Ddos Hybrid Defender>=15.1.0<15.1.10.8
F5 Big-ip Domain Name System>=15.1.0<15.1.10.8
F5 BIG-IP Edge Gateway>=15.1.0<15.1.10.8
F5 Big-ip Fraud Protection Service>=15.1.0<15.1.10.8
F5 Big-ip Global Traffic Manager>=15.1.0<15.1.10.8
F5 Big-ip Link Controller>=15.1.0<15.1.10.8
F5 Big-ip Local Traffic Manager>=15.1.0<15.1.10.8
F5 Big-ip Policy Enforcement Manager>=15.1.0<15.1.10.8
F5 BIG-IP SSL Orchestrator>=15.1.0<15.1.10.8
F5 Big-ip Webaccelerator>=15.1.0<15.1.10.8
F5 Big-ip Websafe>=15.1.0<15.1.10.8
F5 BIG-IP Access Policy Manager>=16.1.0<16.1.6
F5 BIG-IP Advanced Firewall Manager>=16.1.0<16.1.6
F5 Big-ip Advanced Web Application Firewall>=16.1.0<16.1.6
F5 BIG-IP Analytics>=16.1.0<16.1.6
F5 Big-ip Application Acceleration Manager>=16.1.0<16.1.6
F5 BIG-IP Application Security Manager>=16.1.0<16.1.6
F5 Big-ip Application Visibility And Reporting>=16.1.0<16.1.6
F5 Big-ip Automation Toolchain>=16.1.0<16.1.6
F5 Big-ip Carrier-grade Nat>=16.1.0<16.1.6
F5 BIG-IP Container Ingress Services>=16.1.0<16.1.6
F5 Big-ip Ddos Hybrid Defender>=16.1.0<16.1.6
F5 Big-ip Domain Name System>=16.1.0<16.1.6
F5 BIG-IP Edge Gateway>=16.1.0<16.1.6
F5 Big-ip Fraud Protection Service>=16.1.0<16.1.6
F5 Big-ip Global Traffic Manager>=16.1.0<16.1.6
F5 Big-ip Link Controller>=16.1.0<16.1.6
F5 Big-ip Local Traffic Manager>=16.1.0<16.1.6
F5 Big-ip Policy Enforcement Manager>=16.1.0<16.1.6
F5 BIG-IP SSL Orchestrator>=16.1.0<16.1.6
F5 Big-ip Webaccelerator>=16.1.0<16.1.6
F5 Big-ip Websafe>=16.1.0<16.1.6
F5 BIG-IP Access Policy Manager>=17.1.0<17.1.2.2
F5 BIG-IP Advanced Firewall Manager>=17.1.0<17.1.2.2
F5 Big-ip Advanced Web Application Firewall>=17.1.0<17.1.2.2
F5 BIG-IP Analytics>=17.1.0<17.1.2.2
F5 Big-ip Application Acceleration Manager>=17.1.0<17.1.2.2
F5 BIG-IP Application Security Manager>=17.1.0<17.1.2.2
F5 Big-ip Application Visibility And Reporting>=17.1.0<17.1.2.2
F5 Big-ip Automation Toolchain>=17.1.0<17.1.2.2
F5 Big-ip Carrier-grade Nat>=17.1.0<17.1.2.2
F5 BIG-IP Container Ingress Services>=17.1.0<17.1.2.2
F5 Big-ip Ddos Hybrid Defender>=17.1.0<17.1.2.2
F5 Big-ip Domain Name System>=17.1.0<17.1.2.2
F5 BIG-IP Edge Gateway>=17.1.0<17.1.2.2
F5 Big-ip Fraud Protection Service>=17.1.0<17.1.2.2
F5 Big-ip Global Traffic Manager>=17.1.0<17.1.2.2
F5 Big-ip Link Controller>=17.1.0<17.1.2.2
F5 Big-ip Local Traffic Manager>=17.1.0<17.1.2.2
F5 Big-ip Policy Enforcement Manager>=17.1.0<17.1.2.2
F5 BIG-IP SSL Orchestrator>=17.1.0<17.1.2.2
F5 Big-ip Webaccelerator>=17.1.0<17.1.2.2
F5 Big-ip Websafe>=17.1.0<17.1.2.2
F5 Big-ip Next Cloud-native Network Functions>=1.1.0<=1.4.0
Event History
Oct 15, 2025
Advisory Published
via F5·10:32 AM
Data Sourced
via F5·10:32 AM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·01:55 PM
Data Sourced
via MITRE·01:55 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·02:15 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-59781?
CVE-2025-59781 is considered a medium severity vulnerability due to its potential impact on memory resource utilization.
2
How do I fix CVE-2025-59781?
To mitigate CVE-2025-59781, upgrade affected F5 BIG-IP products to the recommended versions specified in the advisory.
3
What is the impact of CVE-2025-59781 on F5 BIG-IP systems?
The impact of CVE-2025-59781 on F5 BIG-IP systems includes increased memory resource utilization which can affect performance.
4
Which versions of F5 BIG-IP are affected by CVE-2025-59781?
CVE-2025-59781 affects multiple versions of F5 BIG-IP, specifically those before the recommended upgrades noted in their remediation.
5
Is there a workaround for CVE-2025-59781?
Currently, there are no official workarounds for CVE-2025-59781; updating to a fixed version is the advised course of action.