On versions 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, when a BIG-IP system that has a virtua…

published 2020-10-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27087

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

On versions 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, when a BIG-IP system that has a virtual server configured with an HTTP compression profile processes compressed HTTP message payloads that require deflation, a Slowloris-style attack can trigger an out-of-memory condition on the BIG-IP system.

Patch / fix

fixed in 11

f5 big-ip_access_policy_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_advanced_firewall_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_analytics 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_application_acceleration_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_application_security_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_domain_name_system 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_fraud_protection_service 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_global_traffic_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_link_controller 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_local_traffic_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1
f5 big-ip_policy_enforcement_manager 11.6.5.2, 12.1.5.2, 14.1.2.4, 15.1.1

Exploit prediction

1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

n/a BIG-IP

References

support.f5.com /csp/article/K26244025
vendor-advisory

Sources

CVE List CVE-2020-5933
NVD CVE-2020-5933

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary