CVE-2021-23034

highpriority · track · 30EPSS 0.009 · 61 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.95% (61st) EPSS

CVSS 7.1 · high

Is it mine?

45 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-27

On BIG-IP version 16.x before 16.1.0 and 15.1.x before 15.1.3.1, when a DNS profile using a DNS cache resolver is configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v2.07.1highAV:N/AC:M/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-668USprimaryCWE-20USCWE-20USCWE-688US

affected products (45)

Products and version ranges known to be affected.

n/a BIG-IP≤ 16.x before 16.1.0 and 15.1.x before 15.1.3.1enisa_euvdEU
F5 Networks, Inc. BIG-IP Access Policy Manager15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Access Policy Manager16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Advanced Firewall Manager15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Advanced Firewall Manager16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Analytics15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Analytics16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Application Acceleration Manager15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Application Acceleration Manager16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Application Security Manager15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Application Security Manager16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP DNS15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP DNS16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Fraud Protection Service15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Fraud Protection Service16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Global Traffic Manager15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Global Traffic Manager16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Link Controller15.1.0 → 15.1.3.1fstec_bduRU
F5 Networks, Inc. BIG-IP Link Controller16.0.0 → 16.1.0fstec_bduRU
F5 Networks, Inc. BIG-IP Local Traffic Manager15.1.0 → 15.1.3.1fstec_bduRU

showing 20 of 45

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2021-09-14modified 2026-06-17

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references (6)

External citations — patches, advisories, analysis.

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