VulnerabilityModified

CVE-2017-3790

HIGH 8.6EPSS 3.49%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.49%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A vulnerability in the received packet parser of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) software could allow an unauthenticated, remote attacker to cause a reload of the affected system, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient size validation of user-supplied data. An attacker could exploit this vulnerability by sending crafted H.224 data in Real-Time Transport Protocol (RTP) packets in an H.323 call. An exploit could allow the attacker to overflow a buffer in a cache that belongs to the received packet parser, which will result in a crash of the application, resulting in a DoS condition. All versions of Cisco Expressway Series Software and Cisco TelePresence VCS Software prior to version X8.8.2 are vulnerable. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. Cisco Bug IDs: CSCus99263.

CVSS 3.0: 8.6 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS: 3.49% probability · 88th percentile
CISA KEV: Not listed
Weakness: CWE-399, CWE-20, CWE-119
Affected: cisco/expressway · cisco/telepresence video communication server
Source: psirt@cisco.com

References

http://www.securityfocus.com/bid/95786Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037697
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170125-expresswayVendor Advisory
http://www.securityfocus.com/bid/95786Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037697
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170125-expresswayVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.