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High severity · published Jul 4, 2019
CVE-2019-1886
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
8.6
CVSS
1.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asyncos · Cisco
10.5 before 10.5.5-005; 11.5 before 11.5.2-020 · source: NVD
WS
Web Security Appliance · Cisco
10.5.2-072; 10.5.3-025; 11.7.0-fcs-334 · source: NVD
Affected product
AS
Asyncos
Cisco
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-1886
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-1886
Third Party Advisory
http://www.securityfocus.com/bid/109049
Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos
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