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.
Conclusion & alert: CVE-2017-3790 is rated High Risk (68.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.49%). Core evidence: EPSS rose +3.19% over the last day, indicating growing attacker interest. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.30% | 3.49% | +3.19% |
| 2 | 2025-03-30 | 0.53% | 0.30% | -0.23% |
| 3 | 2025-03-29 | — | 0.53% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.6 | 3.0 | HIGH |
|
3.9 | 4.0 | [email protected] |
| 7.8 | 2.0 | HIGH |
|
10.0 | 6.9 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| cisco | expressway | x8.1.0 | cpe:2.3:a:cisco:expressway:x8.1.0:*:*:*:*:*:*:* |
| cisco | expressway | x8.1.1 | cpe:2.3:a:cisco:expressway:x8.1.1:*:*:*:*:*:*:* |
| cisco | expressway | x8.1.2 | cpe:2.3:a:cisco:expressway:x8.1.2:*:*:*:*:*:*:* |
| cisco | expressway | x8.1_base | cpe:2.3:a:cisco:expressway:x8.1_base:*:*:*:*:*:*:* |
| cisco | expressway | x8.2.1 | cpe:2.3:a:cisco:expressway:x8.2.1:*:*:*:*:*:*:* |
| cisco | expressway | x8.2.2 | cpe:2.3:a:cisco:expressway:x8.2.2:*:*:*:*:*:*:* |
| cisco | expressway | x8.2_base | cpe:2.3:a:cisco:expressway:x8.2_base:*:*:*:*:*:*:* |
| cisco | expressway | x8.5 | cpe:2.3:a:cisco:expressway:x8.5:rc4:*:*:*:*:*:* |
| cisco | expressway | x8.5.0 | cpe:2.3:a:cisco:expressway:x8.5.0:*:*:*:*:*:*:* |
| cisco | expressway | x8.5.1 | cpe:2.3:a:cisco:expressway:x8.5.1:*:*:*:*:*:*:* |
| cisco | expressway | x8.5.2 | cpe:2.3:a:cisco:expressway:x8.5.2:*:*:*:*:*:*:* |
| cisco | expressway | x8.5.3 | cpe:2.3:a:cisco:expressway:x8.5.3:*:*:*:*:*:*:* |
| cisco | expressway | x8.5_base | cpe:2.3:a:cisco:expressway:x8.5_base:*:*:*:*:*:*:* |
| cisco | expressway | x8.6.0 | cpe:2.3:a:cisco:expressway:x8.6.0:*:*:*:*:*:*:* |
| cisco | expressway | x8.6.1 | cpe:2.3:a:cisco:expressway:x8.6.1:*:*:*:*:*:*:* |
| cisco | expressway | x8.7.0 | cpe:2.3:a:cisco:expressway:x8.7.0:*:*:*:*:*:*:* |
| cisco | expressway | x8.7.1 | cpe:2.3:a:cisco:expressway:x8.7.1:*:*:*:*:*:*:* |
| cisco | expressway | x8.7.2 | cpe:2.3:a:cisco:expressway:x8.7.2:*:*:*:*:*:*:* |
| cisco | expressway | x8.7.3 | cpe:2.3:a:cisco:expressway:x8.7.3:*:*:*:*:*:*:* |
| cisco | expressway | x8.8.0 | cpe:2.3:a:cisco:expressway:x8.8.0:*:*:*:*:*:*:* |
| cisco | expressway | x8.8.1 | cpe:2.3:a:cisco:expressway:x8.8.1:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x5.2_base | cpe:2.3:a:cisco:telepresence_video_communication_server:x5.2_base:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x6.0_base | cpe:2.3:a:cisco:telepresence_video_communication_server:x6.0_base:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x6.1_base | cpe:2.3:a:cisco:telepresence_video_communication_server:x6.1_base:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.0.0 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.0:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.0.1 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.1:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.0.2 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.2:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.0.3 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.3:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.1_base | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.1_base:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.2.0 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.0:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.2.1 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.1:*:*:*:*:*:*:* |
| cisco | telepresence_video_communication_server | x7.2.2 | cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.2:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| http://www.securityfocus.com/bid/95786 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1037697 | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170125-expressway | Vendor Advisory |