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Unrated severityNVD Advisory· Published Oct 15, 2025· Updated Feb 26, 2026

BIG-IP DNS cache vulnerability

CVE-2025-59781

Description

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.

Affected products

3
  • F5, Inc./Big IPllm-fuzzy2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: 17.1.0
  • F5/BIG-IP Next CNFv5
    Range: 1.1.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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