CVE-2017-12857

Polycom SoundStation IP, VVX, and RealPresence Trio that are running software older than UCS 4.0.12, 5.4.5 rev AG, 5.4.7, 5.5.2, or 5.6.0 are affected by a vulnerability in their UCS web application. This vulnerability could allow an authenticated remote attacker to read a segment of the phone's memory which could contain an administrator's password or other sensitive information.

Published: 2017-08-25 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-12857 is rated Moderate Risk (53.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.29%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-12857

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 2026-04-21 0.40% 0.29% -0.11%
2 2025-03-30 0.65% 0.40% -0.25%
3 2025-03-29 — 0.65% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-12857

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2017-12857

Affected software / configurations for CVE-2017-12857

Vendor Product Version Raw CPE
polycom unified_communications_software <= 4.0.11 cpe:2.3:o:polycom:unified_communications_software:*:*:*:*:*:*:*:*
polycom unified_communications_software <= 5.4.6 cpe:2.3:o:polycom:unified_communications_software:*:*:*:*:*:*:*:*
polycom unified_communications_software <= 5.5.1 cpe:2.3:o:polycom:unified_communications_software:*:*:*:*:*:*:*:*
polycom unified_communications_software <= 5.4.4 cpe:2.3:o:polycom:unified_communications_software:*:*:*:*:*:*:*:*

References for CVE-2017-12857

cvelogic Threat Intelligence