CVE & CISA-KEV Catalog

CVE-2021-23000

HIGH

7.5

CVSS v3

Description

On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

How to fix

Remediation Available

big-ip access policy managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip advanced firewall managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip advanced web application firewallNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip analyticsNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip application acceleration managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip application security managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip ddos hybrid defenderNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip domain name systemNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip fraud protection serviceNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip global traffic managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip link controllerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip local traffic managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

big-ip policy enforcement managerNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

ssl orchestratorNVD

Affected:>= 13.1.3.4, < 13.1.3.6Fixed in:13.1.3.6CVE-2021-23000derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.93%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Vendor Advisory1

support.f5.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.