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CVE-2021-23049

HIGHCVSS 7.5/10EPSS 0.93%

Last modified

CVE-2021-23049 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On BIG-IP version 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3, when the iRules RESOLVER::summarize command is used on a virtual server, undisclosed requests can cause an increase in Traffic Management Microkernel (TMM) memory utilization resulting in an out-of-memory condition and a denial-of-service (DoS). Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

Description

On BIG-IP version 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3, when the iRules RESOLVER::summarize command is used on a virtual server, undisclosed requests can cause an increase in Traffic Management Microkernel (TMM) memory utilization resulting in an out-of-memory condition and a denial-of-service (DoS). Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
0.93%

56.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 15.1.0, < 15.1.3
F5Big-Ip Access Policy Manager>= 16.0.0, < 16.0.1.2
F5Big-Ip Advanced Firewall Manager>= 15.1.0, < 15.1.3
F5Big-Ip Advanced Firewall Manager>= 16.0.0, < 16.0.1.2
F5Big-Ip Advanced Web Application Firewall>= 15.1.0, < 15.1.3
F5Big-Ip Advanced Web Application Firewall>= 16.0.0, < 16.0.1.2
F5Big-Ip Analytics>= 15.1.0, < 15.1.3
F5Big-Ip Analytics>= 16.0.0, < 16.0.1.2
F5Big-Ip Application Acceleration Manager>= 15.1.0, < 15.1.3
F5Big-Ip Application Acceleration Manager>= 16.0.0, < 16.0.1.2
F5Big-Ip Application Security Manager>= 15.1.0, < 15.1.3
F5Big-Ip Application Security Manager>= 16.0.0, < 16.0.1.2
F5Big-Ip Domain Name System>= 15.1.0, < 15.1.3
F5Big-Ip Domain Name System>= 16.0.0, < 16.0.1.2
F5Big-Ip Fraud Protection Service>= 15.1.0, < 15.1.3
F5Big-Ip Fraud Protection Service>= 16.0.0, < 16.0.1.2
F5Big-Ip Global Traffic Manager>= 15.1.0, < 15.1.3
F5Big-Ip Global Traffic Manager>= 16.0.0, < 16.0.1.2
F5Big-Ip Link Controller>= 15.1.0, < 15.1.3
F5Big-Ip Link Controller>= 16.0.0, < 16.0.1.2
F5Big-Ip Local Traffic Manager>= 15.1.0, < 15.1.3
F5Big-Ip Local Traffic Manager>= 16.0.0, < 16.0.1.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-23049?
On BIG-IP version 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3, when the iRules RESOLVER::summarize command is used on a virtual server, undisclosed requests can cause an increase in Traffic Management Microkernel (TMM) memory utilization resulting in an out-of-memory condition and a denial-of-service (DoS). Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2021-23049?
CVE-2021-23049 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23049?
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-2021-23049?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST