Vulnerability · Published Oct 15, 2025 · Assigned by f5
CVE-2025-59781BIG-IP DNS cache vulnerability
High 7.5
In plain English
A high-severity security flaw in BIG-IP from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 71.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| F5 | BIG-IP | 17.1.0 – before 17.1.2.216.1.0 – before 16.1.615.1.0 – before 15.1.10.8 |
| F5 | BIG-IP Next CNF | 1.1.0 – before * |
Weakness: CWE-459 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://my.f5.com/manage/s/article/K000150637 vendor-advisory