AUGUST 4, 2026
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Case File

CVE-2017-17704

HIGH · CVSS 7.4 EPSS 1.00%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2017-12-31 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.4. See the original NVD description below for full technical details.

CVE
CVE-2017-17704
Severity
HIGH
CVSS
7.4
EPSS
1.00%

Original NVD Description

A door-unlocking issue was discovered on Software House iStar Ultra devices through 6.5.2.20569 when used in conjunction with the IP-ACM Ethernet Door Module. The communications between the IP-ACM and the iStar Ultra is encrypted using a fixed AES key and IV. Each message is encrypted in CBC mode and restarts with the fixed IV, leading to replay attacks of entire messages. There is no authentication of messages beyond the use of the fixed AES key, so message forgery is also possible.