No exploitation reportedFix available

CVE-2019-1886

Q: Is CVE-2019-1886 actively exploited?

Active exploitation of CVE-2019-1886 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-1886?

CVE-2019-1886 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2019-07-04
WeaknessCWE-20 · CWE-295

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

A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.

Timeline

dates in UTC

2019-07-0420:15CVE 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-2019-1886?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-1886?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco web security appliance

Branch	Affected	Fixed in	Source
10.5	= 10.5.2-072	no fix published	NVD
10.5	= 10.5.3-025	no fix published	NVD
11.7	= 11.7.0-fcs-334	no fix published	NVD

Cisco asyncos

Branch	Affected	Fixed in	Source
11.5	≥ 11.5, < 11.5.2-020	11.5.2-020	NVD
10.5	≥ 10.5, < 10.5.5-005	10.5.5-005	NVD

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

Fix

Advisories and patches

tools.cisco.comVendor Advisory

Detection

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

Sources

CISA-ADPSSVC decisionnone2024-11-19
OpenCVESSVC decisionnone—
NVDCVSS 3.18.6read 2026-10-23
CNACVSS 3.08.6read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-20read 2026-10-23
NVDweakness (CWE)CWE-295read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Published: 2019-07-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-1886?

Is CVE-2019-1886 actively exploited?

Active exploitation of CVE-2019-1886 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-1886?

CVE-2019-1886 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

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