CVE-2021-23008

CRITICAL

9.8

CVSS Score

Published: May 10, 2021 at 01:13 PM UTC

Updated: June 17, 2026 at 03:38 AM UTC

1 product affected across 1 vendorBig IP Access Policy Manager

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Severity

CRITICAL9.8

Exploit prediction

EPSS 1%

Description

On version 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.4, 12.1.x before 12.1.6, and all versions of 16.0.x and 11.6.x., BIG-IP APM AD (Active Directory) authentication can be bypassed via a spoofed AS-REP (Kerberos Authentication Service Response) response sent over a hijacked KDC (Kerberos Key Distribution Center) connection or from an AD server compromised by an attacker. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Big IP Access Policy Manager · F5

95%

11.5.2 ≤ v < 11.6.512.1.0 ≤ v < 12.1.513.1.0 ≤ v < 13.1.314.1.0 ≤ v < 14.1.315.0.0 ≤ v < 15.1.215.1 ≤ v < 15.1.316.0.0 ≤ v < 16.0.1

Affected range stops below 11.6.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 12.1.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 13.1.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://support.f5.com/csp/article/K51213246

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.f5.com/csp/article/K51213246

CVSS

9.8CRITICAL[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-287

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