Cyber Resilience

CVE-2021-23009

HighDDoS

Published: 10 May 2021

Published
10 May 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0065 71.2th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-23009 is a high-severity Infinite Loop (CWE-835) vulnerability in F5 Big-Ip Access Policy Manager. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 28.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted.…

more

There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE(s)
CWE-835

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

f5
big-ip access policy manager
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip advanced firewall manager
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip advanced web application firewall
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip analytics
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip application acceleration manager
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip application security manager
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip ddos hybrid defender
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip domain name system
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip fraud protection service
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
f5
big-ip global traffic manager
15.1.0 — 15.1.3 · 16.0.0 — 16.0.1.1
+4 more product configuration(s) — see NVD for full list

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CP-7 Alternate Processing Site
addresses: CWE-835

Enables transfer to alternate site if an infinite loop at the primary renders processing unavailable.

SC-5 Denial-of-service Protection
addresses: CWE-835

Detects and mitigates infinite loops that produce sustained resource consumption.

References