How severe is CVE-2018-18566?

CVE-2018-18566 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2018-18566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-18566?

CVE-2018-18566 primarily affects Polycom Unified Communications Software. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-18566?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-18566 published?

CVE-2018-18566 was published on 2018-10-24 and last updated on 2026-06-17.

CVE-2018-18566

CVE-2018-18566 is a medium-severity vulnerability in Polycom Unified Communications Software with a CVSS 3.x base score of 5.3. 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: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Polycom Unified Communications Software
Published: 2018-10-24
Last modified: 2026-06-17

Description

The SIP service in Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allow remote attackers to obtain sensitive phone configuration information by leveraging use with an on-premise installation with Skype for Business.

Frequently asked questions

What is CVE-2018-18566?: The SIP service in Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allow remote attackers to obtain sensitive phone configuration information by leveraging use with an on-premise installation with Skype for Business.
How severe is CVE-2018-18566?: CVE-2018-18566 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2018-18566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-18566?: CVE-2018-18566 primarily affects Polycom Unified Communications Software. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-18566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-18566 published?: CVE-2018-18566 was published on 2018-10-24 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:polycom:unified_communications_software:*:*:*:*:*:*:*:*
cpe:2.3:o:polycom:vvx_601_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:polycom:vvx_500_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Polycom Unified Communications Software

CVE-2017-12857 — High (CVSS 8.8): Polycom SoundStation IP, VVX, and RealPresence Trio that are running software older than UCS 4.0.12, 5.4.5 rev AG,…
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…

All CVEs affecting Polycom Unified Communications Software →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →