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Review reviewHigh

CVE-2026-40629

F5 BIG-IP, BIG-IP Next SPK, BIG-IP Next CNF

When SSL profiles are configured on a virtual server, undisclosed traffic can cause the virtual server to stop processing new client connections. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS
8.7
EPSS
0.32%
24.9% percentile
CISA KEV
Not listed
Published
2026.05.14
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.32%
Technical severityCVSS 8.7

Vulnerability overview

When SSL profiles are configured on a virtual server, undisclosed traffic can cause the virtual server to stop processing new client connections. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected product and versions

Product
F5 BIG-IP, BIG-IP Next SPK, BIG-IP Next CNF
Affected versions
17.5.0, 17.1.0, 16.1.0, 2.0.0, 1.7.0, 1.1.0, >= 17.1.0 <= 17.1.3, >= 17.5.0 <= 17.5.1, >= 16.1.0 <= 16.1.6, >= 1.7.0 <= 1.7.15, >= 2.0.0 <= 2.0.2, 1.4.0, >= 2.0.0 <= 2.1.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that F5 BIG-IP, BIG-IP Next SPK, BIG-IP Next CNF and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
CWE
CWE-770