CVE-2026-63020: f5 big-ip
Vulnerability summary
CVE-2026-63020 is a low (CVSS 3.1) vulnerability in f5 big-ip. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13% of scored vulnerabilities.
Timeline
- 02-09-2026PublishedVulnerability first disclosed.
- 02-09-2026Last modifiedVulnerability information updated.
Description
A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages Impact: An attacker may trick authenticated BIG-IP users into accessing malicious links and reflect a spoofed error message in the victim's BIG-IP Configuration utility web browser session. This is a control plane issue; there is no data plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS metrics
4 scores · 2 sources · 2 versions- NVDNIST2.3LowCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVDNIST3.1LowCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.23%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
+0.04 pp
From 0.19% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
F522 products
- big-ip≥ 21.1.0, < 21.1.0.1 | ≥ 21.0.0, < 21.0.0.3 | ≥ 17.5.0, < 17.5.1.8 | ≥ 17.1.0, < 17.1.3.4
- big-ip_access_policy_manager≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | ≥ 21.0.0, ≤ 21.1.0
- big-ip_advanced_firewall_manager≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | ≥ 21.0.0, ≤ 21.1.0
- big-ip_advanced_web_application_firewall≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | ≥ 21.0.0, ≤ 21.1.0
- big-ip_analytics≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | ≥ 21.0.0, ≤ 21.1.0
1 vendor · 22 products