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CVE-2026-42409— BIG-IP HTTP/2 vulnerability

CVSS 7.5 · High EPSS 0.08% · P24

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 10

VendorProductVersion RangeStatus
F5BIG-IP21.1.0< *unaffected
21.0.0< 21.0.0.1affected
17.5.0< 17.5.1.4affected
17.1.0< 17.1.3.1affected
16.1.0< *affected
F5BIG-IP Next CNF2.0.0< 2.0.3affected
1.4.0< 1.4.1affected
F5BIG-IP Next for Kubernetes2.0.0< 2.1.1affected
F5BIG-IP Next SPK2.0.0< 2.0.3affected
1.7.0< 1.7.17affected
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I. Basic Information for CVE-2026-42409

Vulnerability Information
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Vulnerability Title
BIG-IP HTTP/2 vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
Vulnerability Title
F5 BIG-IP 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 BIG-IP是美国F5公司的一款集成了网络流量管理、应用程序安全管理、负载均衡等功能的应用交付平台。 F5 BIG-IP存在代码问题漏洞，该漏洞源于配置HTTP/2配置文件及包含HTTP::redirect或HTTP::respond命令的iRule时，未公开请求可能导致TMM进程终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
F5BIG-IP 21.1.0 ~ * -
F5BIG-IP Next SPK 2.0.0 ~ 2.0.3 -
F5BIG-IP Next CNF 2.0.0 ~ 2.0.3 -
F5BIG-IP Next for Kubernetes 2.0.0 ~ 2.1.1 -

II. Public POCs for CVE-2026-42409

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III. Intelligence Information for CVE-2026-42409

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Same Patch Batch · F5 · 2026-05-13 · 51 CVEs total

CVE-2026-412259.1 CRITICALiControl REST vulnerability
CVE-2026-419578.8 HIGHBIG-IP and BIG-IQ Configuration utility vulnerability
CVE-2026-400618.7 HIGHiControl REST and tmsh vulnerability
CVE-2026-429308.7 HIGHAppliance mode iControl REST vulnerability
CVE-2026-326738.7 HIGHBIG-IP scripted monitor vulnerability
CVE-2026-341768.7 HIGHKnowledge Appliance mode iControl REST vulnerability
CVE-2026-429458.1 HIGHNGINX ngx_http_rewrite_module vulnerability
CVE-2026-209168.1 HIGHBIG-IQ iControl REST vulnerability
CVE-2026-412177.9 HIGHBIG-IP tmsh vulnerability
CVE-2026-400677.5 HIGHBIG-IP APM Vulnerability
CVE-2026-412187.5 HIGHBIG-IP PEM iRules vulnerability
CVE-2026-394557.5 HIGHBIG-IP Configuration utility vulnerability
CVE-2026-394587.5 HIGHBIG-IP DNS Cache vulnerability
CVE-2026-404237.5 HIGHBIG-IP SIP profile vulnerability
CVE-2026-406297.5 HIGHBIG-IP SSL/TLS vulnerability
CVE-2026-429207.5 HIGHBIG-IP DTLS Vulnerability
CVE-2026-406187.5 HIGHBIG-IP SSL/TLS vulnerability
CVE-2026-419567.5 HIGHBIG-IP TMM Vulnerability
CVE-2026-400607.5 HIGHBIG-IP Advanced WAF and ASM vulnerability
CVE-2026-412277.5 HIGHBIG-IP HTTP/2 Layer 7 Dos Protection vulnerability

Showing top 20 of 51 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: BIG-IP
Same vendor: F5
Same weakness: CWE-476

V. Comments for CVE-2026-42409

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