How severe is CVE-2018-8474?

CVE-2018-8474 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-8474 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-8474?

CVE-2018-8474 affects Microsoft Lync For Mac. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-8474?

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-2018-8474 published?

CVE-2018-8474 was published on 2018-09-13 and last updated on 2026-06-17.

CVE-2018-8474

CVE-2018-8474 is a high-severity vulnerability in Microsoft Lync For Mac with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 38% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 38% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Microsoft Lync For Mac
Published: 2018-09-13
Last modified: 2026-06-17

Description

A security feature bypass vulnerability exists when Lync for Mac 2011 fails to properly sanitize specially crafted messages, aka "Lync for Mac 2011 Security Feature Bypass Vulnerability." This affects Microsoft Lync.

Frequently asked questions

What is CVE-2018-8474?: A security feature bypass vulnerability exists when Lync for Mac 2011 fails to properly sanitize specially crafted messages, aka "Lync for Mac 2011 Security Feature Bypass Vulnerability." This affects Microsoft Lync.
How severe is CVE-2018-8474?: CVE-2018-8474 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-8474 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-8474?: CVE-2018-8474 affects Microsoft Lync For Mac. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-8474?: 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-2018-8474 published?: CVE-2018-8474 was published on 2018-09-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:lync_for_mac:2011:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Lync For Mac

CVE-2017-0129 — High (CVSS 7.5): Microsoft Lync for Mac 2011 fails to properly validate certificates, allowing remote attackers to alter server-client…

All CVEs affecting Microsoft Lync For Mac →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →