No exploitation reportedFix available

CVE-2021-22985

Q: Is CVE-2021-22985 actively exploited?

Active exploitation of CVE-2021-22985 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-22985?

CVE-2021-22985 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-02-12
Fixed in16.0.1.1 · 15.1.2 · 14.1.2.8 · 13.1.3.6 · 12.1.5.3 · 11.6.5.2
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

On BIG-IP APM version 16.0.x before 16.0.1.1, under certain conditions, when processing VPN traffic with APM, TMM consumes excessive memory. A malicious, authenticated VPN user may abuse this to perform a DoS attack against the APM. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Timeline

dates in UTC

2021-02-1218:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-22985?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-22985?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

F5 big-ip application security manager

Branch	Affected	Fixed in	Source
16.0	≥ 16.0.0, < 16.0.1.1	16.0.1.1	NVD
15.1	≥ 15.1.0, < 15.1.2	15.1.2	NVD
14.1	≥ 14.1.0, < 14.1.2.8	14.1.2.8	NVD
13.1	≥ 13.1.0, < 13.1.3.6	13.1.3.6	NVD
12.1	≥ 12.1.0, < 12.1.5.3	12.1.5.3	NVD
11.6	≥ 11.6.1, < 11.6.5.2	11.6.5.2	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update F5 big-ip application security manager to 16.0.1.1 · 15.1.2 · 14.1.2.8 · 13.1.3.6 · 12.1.5.3 · 11.6.5.2

Advisories and patches

support.f5.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-02-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-22985?

Is CVE-2021-22985 actively exploited?

Active exploitation of CVE-2021-22985 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-22985?

CVE-2021-22985 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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