No exploitation reported

CVE-2019-6596

No exploitation reported by the sources we read.

Published2019-03-13

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

In BIG-IP 14.0.0-14.0.0.2, 13.0.0-13.1.1.1, 12.1.0-12.1.3.6, 11.6.1-11.6.3.2, or 11.5.1-11.5.8, when processing fragmented ClientHello messages in a DTLS session TMM may corrupt memory eventually leading to a crash. Only systems offering DTLS connections via APM are impacted.

Timeline

dates in UTC

2019-03-1322:29CVE 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-2019-6596?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-6596?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
11.5	≥ 11.5.1, ≤ 11.5.8	no fix published	NVD
11.6	≥ 11.6.1, ≤ 11.6.3	no fix published	NVD
12.1	≥ 12.1.0, ≤ 12.1.3	no fix published	NVD
13.x	≥ 13.0.0, ≤ 13.1.1	no fix published	NVD
14.0	= 14.0.0	no fix published	NVD

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

Fix

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 score1.4 %2026-10-23

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: 2019-03-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-6596?

Is CVE-2019-6596 actively exploited?

Active exploitation of CVE-2019-6596 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-6596?

CVE-2019-6596 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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