CVE-2020-5941 json
On BIG-IP versions 16.0.0-16.0.0.1 and 15.1.0-15.1.0.5, using the RESOLV::lookup command within an iRule may cause the Traffic Management M…
published 2020-11-05 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27095
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 64%
- public exploits
- 0
- none known
Summary
On BIG-IP versions 16.0.0-16.0.0.1 and 15.1.0-15.1.0.5, using the RESOLV::lookup command within an iRule may cause the Traffic Management Microkernel (TMM) to generate a core file and restart. This issue occurs when data exceeding the maximum limit of a hostname passes to the RESOLV::lookup command.
Patch / fix
- f5 big-ip_access_policy_manager 15.1.1, 16.0.1
- f5 big-ip_advanced_firewall_manager 15.1.1, 16.0.1
- f5 big-ip_analytics 15.1.1, 16.0.1
- f5 big-ip_application_acceleration_manager 15.1.1, 16.0.1
- f5 big-ip_application_security_manager 15.1.1, 16.0.1
- f5 big-ip_domain_name_system 15.1.1, 16.0.1
- f5 big-ip_fraud_protection_service 15.1.1, 16.0.1
- f5 big-ip_global_traffic_manager 15.1.1, 16.0.1
- f5 big-ip_link_controller 15.1.1, 16.0.1
- f5 big-ip_local_traffic_manager 15.1.1, 16.0.1
- f5 big-ip_policy_enforcement_manager 15.1.1, 16.0.1
Exploit prediction
1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- n/a BIG-IP
References
-
support.f5.com
/csp/article/K03125360
vendor-advisory
Sources
- CVE List CVE-2020-5941
- NVD CVE-2020-5941
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