How severe is CVE-2017-17704?

CVE-2017-17704 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2017-17704 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-17704?

CVE-2017-17704 affects Swhouse Istar Ultra Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-17704?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-17704 published?

CVE-2017-17704 was published on 2017-12-31 and last updated on 2026-06-17.

CVE-2017-17704

CVE-2017-17704 is a high-severity vulnerability in Swhouse Istar Ultra Firmware with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-330.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-330
Affected product: Swhouse Istar Ultra Firmware
Published: 2017-12-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2017-17704?: 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.
How severe is CVE-2017-17704?: CVE-2017-17704 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2017-17704 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-17704?: CVE-2017-17704 affects Swhouse Istar Ultra Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-17704?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-17704 published?: CVE-2017-17704 was published on 2017-12-31 and last updated on 2026-06-17.

References

https://systemoverlord.com/2017/12/18/cve-2017-17704-broken-cryptography-in-istar-ultra-ip-acm-by-software-house.html

Affected products (1)

cpe:2.3:o:swhouse:istar_ultra_firmware:*:*:*:*:*:*:*:*

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