How severe is CVE-2018-18568?

CVE-2018-18568 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-18568 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-18568?

CVE-2018-18568 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-2018-18568?

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

When was CVE-2018-18568 published?

CVE-2018-18568 was published on 2018-10-24 and last updated on 2026-06-17.

CVE-2018-18568

CVE-2018-18568 is a medium-severity vulnerability in Polycom Unified Communications Software with a CVSS 3.x base score of 5.9. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Polycom Unified Communications Software
Published: 2018-10-24
Last modified: 2026-06-17

Description

Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allows man-in-the-middle attackers to obtain sensitive credential information by leveraging failure to validate X.509 certificates when used with an on-premise installation with Skype for Business.

Frequently asked questions

What is CVE-2018-18568?: Polycom VVX 500 and 601 devices 5.8.0.12848 and earlier allows man-in-the-middle attackers to obtain sensitive credential information by leveraging failure to validate X.509 certificates when used with an on-premise installation with Skype for Business.
How severe is CVE-2018-18568?: CVE-2018-18568 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-18568 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-18568?: CVE-2018-18568 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-2018-18568?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-18568 published?: CVE-2018-18568 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-2018-18566 — 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…

All CVEs affecting Polycom Unified Communications Software →

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