BIG-IP
CVE-2025-59781: BIG-IP DNS cache vulnerability
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.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 4.0 8.7
EPSS0.35%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| BIG-IP 17.5 | Not affected |
| BIG-IP 17.1 | 17.1.2.2 or later |
| BIG-IP 16.1 | 16.1.6 or later |
| BIG-IP 15.1 | 15.1.10.8 or later |
| BIG-IP Next CNF 2.0 | Not affected |
| BIG-IP Next CNF 1.1 | 1.4.0-EHF-3 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 12 Oct 2026.