CVE-2019-1886

Name: CVE-2019-1886
Creator: NVD / NIST
Published: 2019-07-04T20:15:11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 1.35%

Last modified Jun 17, 2026

CVE-2019-1886 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 1.35% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability

1.35%

67.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Asyncos	>= 10.5, < 10.5.5-005
Cisco	Asyncos	>= 11.5, < 11.5.2-020
Cisco	Web Security Appliance	10.5.2-072
Cisco	Web Security Appliance	10.5.3-025
Cisco	Web Security Appliance	11.7.0-fcs-334

References

http://www.securityfocus.com/bid/109049Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dosVendor Advisory
http://www.securityfocus.com/bid/109049Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dosVendor Advisory

Timeline

Published: Jul 4, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-1886?

How severe is CVE-2019-1886?

CVE-2019-1886 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.35% probability of exploitation in the next 30 days.

How do I fix CVE-2019-1886?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-1886?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST