CVE-2023-23555: f5 big-ip Improper Initialization
Vulnerability summary
CVE-2023-23555 is a high (CVSS 7.5) Improper Initialization vulnerability in f5 big-ip. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49% of scored vulnerabilities.
Timeline
- 01-02-2023PublishedVulnerability first disclosed.
- 26-03-2025Last modifiedVulnerability information updated.
Description
On BIG-IP Virtual Edition versions 15.1x beginning in 15.1.4 to before 15.1.8 and 14.1.x beginning in 14.1.5 to before 14.1.5.3, and BIG-IP SPK beginning in 1.5.0 to before 1.6.0, when FastL4 profile is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.63%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
0.00 pp
From 0.63% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
F515 products
- big-ip≥ 15.1.4, < 15.1.8 | ≥ 14.1.5, < 14.1.5.3
- big-ip_access_policy_manager≥ 14.1.5, < 14.1.5.3 | ≥ 15.1.4, < 15.1.8
- big-ip_advanced_firewall_manager≥ 14.1.5, < 14.1.5.3 | ≥ 15.1.0, < 15.1.8
- big-ip_analytics≥ 14.1.5, < 14.1.5.3 | ≥ 15.1.4, < 15.1.8
- big-ip_application_acceleration_manager≥ 14.1.5, < 14.1.5.3 | ≥ 15.1.4, < 15.1.8
1 vendor · 15 products
References
1 links- my.f5.com/manage/s/article/K24572686Vendor Advisory