CVE-2020-5921
No exploitation reported by the sources we read.
- Published2020-08-26
- Fixed in15.1.0.5 · 15.0.1.4 · 14.1.2.7 · 12.1.5.2
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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
in BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, Syn flood causes large number of MCPD context messages destined to secondary blades consuming memory leading to MCPD failure. This issue affects only VIPRION hosts with two or more blades installed. Single-blade VIPRION hosts are not affected.
Timeline
dates in UTC- 2020-08-2616:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-5921?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-5921?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.1 | ≥ 15.1.0, < 15.1.0.5 | 15.1.0.5 | NVD |
| 15.0 | ≥ 15.0.0, < 15.0.1.4 | 15.0.1.4 | NVD |
| 14.1 | ≥ 14.1.0, < 14.1.2.7 | 14.1.2.7 | NVD |
| 12.1 | ≥ 12.1.0, < 12.1.5.2 | 12.1.5.2 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.1 | ≥ 15.1.0, < 15.1.0.5 | 15.1.0.5 | NVD |
| 15.0 | ≥ 15.0.0, < 15.0.1.4 | 15.0.1.4 | NVD |
| 14.1 | ≥ 14.1.0, < 14.1.2.7 | 14.1.2.7 | NVD |
| 12.1 | ≥ 12.1.0, < 12.1.5.2 | 12.1.5.2 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.1 | ≥ 15.1.0, < 15.1.0.5 | 15.1.0.5 | NVD |
| 15.0 | ≥ 15.0.0, < 15.0.1.4 | 15.0.1.4 | NVD |
| 14.1 | ≥ 14.1.0, < 14.1.2.7 | 14.1.2.7 | NVD |
| 12.1 | ≥ 12.1.0, < 12.1.5.2 | 12.1.5.2 | NVD |
8 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update F5 big-ip access policy manager to 15.1.0.5 · 15.0.1.4 · 14.1.2.7 · 12.1.5.2
Advisories and patches
- support.f5.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.17.5read 2026-10-23
- NVDCVSS 2.05read 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
- 2020-08-26
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-5921?
Is CVE-2020-5921 actively exploited?
What is the CVSS score for CVE-2020-5921?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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