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CVE-2021-22998

MEDIUMCVSS 5.3/10EPSS 0.95%

Last modified

CVE-2021-22998 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3, and 11.6.x before 11.6.5.3, SYN flood protection thresholds are not enforced in secure network address translation (SNAT) listeners. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3, and 11.6.x before 11.6.5.3, SYN flood protection thresholds are not enforced in secure network address translation (SNAT) listeners. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
0.95%

56.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 11.6.1, < 11.6.5.3
F5Big-Ip Access Policy Manager>= 12.1.0, < 12.1.5.3
F5Big-Ip Access Policy Manager>= 13.1.0, < 13.1.3.6
F5Big-Ip Access Policy Manager>= 14.1.0, < 14.1.4
F5Big-Ip Access Policy Manager>= 15.1.0, < 15.1.2.1
F5Big-Ip Access Policy Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Advanced Firewall Manager>= 11.6.1, < 11.6.5.3
F5Big-Ip Advanced Firewall Manager>= 12.1.0, < 12.1.5.3
F5Big-Ip Advanced Firewall Manager>= 13.1.0, < 13.1.3.6
F5Big-Ip Advanced Firewall Manager>= 14.1.0, < 14.1.4
F5Big-Ip Advanced Firewall Manager>= 15.1.0, < 15.1.2.1
F5Big-Ip Advanced Firewall Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Advanced Web Application Firewall>= 11.6.1, < 11.6.5.3
F5Big-Ip Advanced Web Application Firewall>= 12.1.0, < 12.1.5.3
F5Big-Ip Advanced Web Application Firewall>= 13.1.0, < 13.1.3.6
F5Big-Ip Advanced Web Application Firewall>= 14.1.0, < 14.1.4
F5Big-Ip Advanced Web Application Firewall>= 15.1.0, < 15.1.2.1
F5Big-Ip Advanced Web Application Firewall>= 16.0.0, < 16.0.1.1
F5Big-Ip Analytics>= 11.6.1, < 11.6.5.3
F5Big-Ip Analytics>= 12.1.0, < 12.1.5.3
F5Big-Ip Analytics>= 13.1.0, < 13.1.3.6
F5Big-Ip Analytics>= 14.1.0, < 14.1.4
F5Big-Ip Analytics>= 15.1.0, < 15.1.2.1
F5Big-Ip Analytics>= 16.0.0, < 16.0.1.1
F5Big-Ip Application Acceleration Manager>= 11.6.1, < 11.6.5.3
F5Big-Ip Application Acceleration Manager>= 12.1.0, < 12.1.5.3
F5Big-Ip Application Acceleration Manager>= 13.1.0, < 13.1.3.6
F5Big-Ip Application Acceleration Manager>= 14.1.0, < 14.1.4
F5Big-Ip Application Acceleration Manager>= 15.1.0, < 15.1.2.1
F5Big-Ip Application Acceleration Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Application Security Manager>= 11.6.1, < 11.6.5.3
F5Big-Ip Application Security Manager>= 12.1.0, < 12.1.5.3
F5Big-Ip Application Security Manager>= 13.1.0, < 13.1.3.6
F5Big-Ip Application Security Manager>= 14.1.0, < 14.1.4
F5Big-Ip Application Security Manager>= 15.1.0, < 15.1.2.1
F5Big-Ip Application Security Manager>= 16.0.0, < 16.0.1.1
F5Big-Ip Ddos Hybrid Defender>= 11.6.1, < 11.6.5.3
F5Big-Ip Ddos Hybrid Defender>= 12.1.0, < 12.1.5.3
F5Big-Ip Ddos Hybrid Defender>= 13.1.0, < 13.1.3.6
F5Big-Ip Ddos Hybrid Defender>= 14.1.0, < 14.1.4
F5Big-Ip Ddos Hybrid Defender>= 15.1.0, < 15.1.2.1
F5Big-Ip Ddos Hybrid Defender>= 16.0.0, < 16.0.1.1
F5Big-Ip Domain Name System>= 11.6.1, < 11.6.5.3
F5Big-Ip Domain Name System>= 12.1.0, < 12.1.5.3
F5Big-Ip Domain Name System>= 13.1.0, < 13.1.3.6
F5Big-Ip Domain Name System>= 14.1.0, < 14.1.4
F5Big-Ip Domain Name System>= 15.1.0, < 15.1.2.1
F5Big-Ip Domain Name System>= 16.0.0, < 16.0.1.1
F5Big-Ip Fraud Protection Service>= 11.6.1, < 11.6.5.3
F5Big-Ip Fraud Protection Service>= 12.1.0, < 12.1.5.3

Showing 50 of 84 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-22998?
On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3, and 11.6.x before 11.6.5.3, SYN flood protection thresholds are not enforced in secure network address translation (SNAT) listeners. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
How severe is CVE-2021-22998?
CVE-2021-22998 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22998?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22998?

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Source: NVD / NIST