No exploitation reportedFix available

CVE-2019-6605

Q: Is CVE-2019-6605 actively exploited?

Active exploitation of CVE-2019-6605 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-6605?

CVE-2019-6605 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2019-03-28
Fixed in12.1.0 · 11.6.4 · 11.5.9

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 11.5.1-11.5.8, 11.6.1-11.6.3, and 12.0.x, an undisclosed sequence of packets received by an SSL virtual server and processed by an associated Client SSL or Server SSL profile may cause a denial of service.

Timeline

dates in UTC

2019-03-2821:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2019-6605?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-6605?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 access policy manager

Branch	Affected	Fixed in	Source
12.x	≥ 12.0.0, < 12.1.0	12.1.0	NVD
11.6	≥ 11.6.0, < 11.6.4	11.6.4	NVD
11.5	≥ 11.5.0, < 11.5.9	11.5.9	NVD

F5 big-ip advanced firewall manager

Branch	Affected	Fixed in	Source
12.x	≥ 12.0.0, < 12.1.0	12.1.0	NVD
11.6	≥ 11.6.0, < 11.6.4	11.6.4	NVD
11.5	≥ 11.5.0, < 11.5.9	11.5.9	NVD

F5 big-ip analytics

Branch	Affected	Fixed in	Source
12.x	≥ 12.0.0, < 12.1.0	12.1.0	NVD
11.6	≥ 11.6.0, < 11.6.4	11.6.4	NVD
11.5	≥ 11.5.0, < 11.5.9	11.5.9	NVD

10 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 12.1.0 · 11.6.4 · 11.5.9

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 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
FIRST EPSSEPSS score1.7 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2019-03-28
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-6605?

Is CVE-2019-6605 actively exploited?

Active exploitation of CVE-2019-6605 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-6605?

CVE-2019-6605 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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