CVE-2019-18913

Current Description

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation mechanisms for certain fields in HTTP/HTTPS requests sent through an affected device. A successful attacker could exploit this vulnerability by sending a malicious HTTP/HTTPS request through an affected device. An exploit could allow the attacker to force the device to stop processing traffic, resulting in a DoS condition.

Basic Data

PublishedJuly 04, 2019
Last ModifiedOctober 09, 2019
Assignercve@mitre.org
Data TypeCVE
Data FormatMITRE
Data Version4.0
Problem TypeCWE-20
CVE Data Version4.0

Base Metric V2

CVSS 2 - Version2.0
CVSS 2 - Vector StringAV:N/AC:L/Au:S/C:N/I:N/A:P
CVSS 2 - Access VectorNETWORK
CVSS 2 - Access ComplexityLOW
CVSS 2 - AuthenticationSINGLE
CVSS 2 - Confidentiality ImpactNONE
CVSS 2 - Availability ImpactPARTIAL
CVSS 2 - Base Score4.0
SeverityMEDIUM
Exploitability Score8.0
Impact Score2.9
Obtain All Privilegefalse
Obtain User Privilegefalse
Obtain Other Privilegefalse

Base Metric V3

CVSS 3 - Version3.0
CVSS 3 - Vector StringCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 3 - Attack VectorNETWORK
CVSS 3 - Attack ComplexityLOW
CVSS 3 - Privileges RequiredLOW
CVSS 3 - User InteractionNONE
CVSS 3 - ScopeUNCHANGED
CVSS 3 - Confidentiality ImpactNONE
CVSS 3 - Integrity ImpactNONE
CVSS 3 - Availability ImpactHIGH
CVSS 3 - Base Score6.5
CVSS 3 - Base SeverityMEDIUM
Exploitability Score2.8
Base SeverityMEDIUM

Configurations

  • OR - Configuration 1
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3OSCiscoAsyncos********10.110.5.5-005
    2.3OSCiscoAsyncos********11.511.5.2-020
    2.3OSCiscoAsyncos********11.711.7.0-407
  • OR - Configuration 2
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3ApplicationCiscoWeb Security Appliance10.1.4-017*******
    2.3ApplicationCiscoWeb Security Appliance10.5.2-072*******
    2.3ApplicationCiscoWeb Security Appliance11.5.1-fcs-125*******
    2.3ApplicationCiscoWeb Security Appliance11.7.0-256*******

Vulnerable Software List

VendorProductVersions
Cisco Asyncos *
Cisco Web Security Appliance 10.1.4-017, 10.5.2-072, 11.5.1-fcs-125, 11.7.0-256

References

NameSourceURLTags
20190703 Cisco Web Security Appliance Web Proxy Denial of Service Vulnerabilityhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-asyncos-wsaCISCOVendor Advisory