How severe is CVE-2017-12857?

CVE-2017-12857 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-12857 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12857?

CVE-2017-12857 affects Polycom Unified Communications Software. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-12857?

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-2017-12857 published?

CVE-2017-12857 was published on 2017-08-25 and last updated on 2026-06-17.

CVE-2017-12857

CVE-2017-12857 is a high-severity vulnerability in Polycom Unified Communications Software with a CVSS 3.x base score of 8.8. 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-200.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Polycom Unified Communications Software
Published: 2017-08-25
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2017-12857?: CVE-2017-12857 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-12857 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12857?: CVE-2017-12857 affects Polycom Unified Communications Software. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-12857?: 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-2017-12857 published?: CVE-2017-12857 was published on 2017-08-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:polycom:unified_communications_software:*:*:*:*:*:*:*:*

More vulnerabilities in Polycom Unified Communications Software

CVE-2019-12948 — High (CVSS 8.3): A vulnerability in the web-based management interface of VVX, Trio, SoundStructure, SoundPoint, and SoundStation phones…
CVE-2019-10688 — Medium (CVSS 6.8): VVX products with software versions including and prior to, UCS 5.9.2 with Better Together over Ethernet Connector…
CVE-2019-10689 — Medium (CVSS 6.5): VVX products using UCS software version 5.9.2 and earlier with Better Together over Ethernet Connector (BToE)…
CVE-2018-18568 — Medium (CVSS 5.9): Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allows man-in-the-middle attackers to obtain sensitive…
CVE-2018-18566 — Medium (CVSS 5.3): The SIP service in Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allow remote attackers to obtain sensitive…

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