CVE-2021-23035

Name: CVE-2021-23035
Creator: NVD / NIST
Published: 2021-09-14T18:15:08.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.92%

Last modified Jun 17, 2026

CVE-2021-23035 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On BIG-IP 14.1.x before 14.1.4.4, when an HTTP profile is configured on a virtual server, after a specific sequence of packets, chunked responses can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 0.92% chance of exploitation in the next 30 days.

Description

On BIG-IP 14.1.x before 14.1.4.4, when an HTTP profile is configured on a virtual server, after a specific sequence of packets, chunked responses can cause the Traffic Management Microkernel (TMM) to terminate. 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

0.92%

55.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
F5	Big-Ip Access Policy Manager	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Advanced Firewall Manager	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Analytics	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Application Acceleration Manager	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Application Security Manager	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Domain Name System	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Fraud Protection Service	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Global Traffic Manager	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Link Controller	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Local Traffic Manager	>= 14.1.0, <= 14.1.4.4
F5	Big-Ip Policy Enforcement Manager	>= 14.1.0, <= 14.1.4.4

References

https://support.f5.com/csp/article/K70415522Mitigation, Vendor Advisory
https://support.f5.com/csp/article/K70415522Mitigation, Vendor Advisory

Timeline

Published: Sep 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23035?

How severe is CVE-2021-23035?

CVE-2021-23035 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23035?

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-2021-23035?

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

Scan your code now

Source: NVD / NIST