CVE-2026-42919: F5 BIG-IP Appliance Mode Vulnerability
Vulnerability summary
CVE-2026-42919 is a high (CVSS 7.1) Stack-based Buffer Overflow vulnerability in f5 big-ip. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.1% of scored vulnerabilities.
Timeline
- 13-05-2026PublishedVulnerability first disclosed.
- 14-05-2026Last modifiedVulnerability information updated.
Description
A vulnerability exists in BIG-IP systems that may allow an authenticated attacker with administrative access to escalate their privileges. A successful exploit may allow the attacker to cross a security boundary. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS metrics
4 scores · 2 sources · 2 versions- NVDNIST7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:H/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
- NVDNIST6.7MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
Increase +0.13 pp
From 0.29% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
F522 products
- big-ip≥ 21.0.0, < 21.0.0.1 | ≥ 17.5.0, < 17.5.1.4 | ≥ 17.1.0, < 17.1.3.1 | ≥ 16.1.0 (No fix recorded)
- big-ip_access_policy_manager≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | 21.0.0 | ≥ 16.1.0, ≤ 16.1.6
- big-ip_advanced_firewall_manager≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | 21.0.0 | ≥ 16.1.0, ≤ 16.1.6
- big-ip_advanced_web_application_firewall≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | 21.0.0 | ≥ 16.1.0, ≤ 16.1.6
- big-ip_analytics≥ 17.1.0, ≤ 17.1.3 | ≥ 17.5.0, ≤ 17.5.1 | 21.0.0 | ≥ 16.1.0, ≤ 16.1.6
1 vendor · 22 products