How severe is CVE-2017-8503?

CVE-2017-8503 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-8503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8503?

CVE-2017-8503 affects Microsoft Edge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-8503?

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-2017-8503 published?

CVE-2017-8503 was published on 2017-08-08 and last updated on 2026-06-17.

CVE-2017-8503

CVE-2017-8503 is a high-severity vulnerability in Microsoft Edge 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.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.6
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Edge
Published: 2017-08-08
Last modified: 2026-06-17

Description

Microsoft Edge in Microsoft Windows 10 1511, 1607, 1703, and Windows Server 2016 allows an attacker to escape from the AppContainer sandbox, aka "Microsoft Edge Elevation of Privilege Vulnerability". This CVE ID is unique from CVE-2017-8642.

Frequently asked questions

What is CVE-2017-8503?: Microsoft Edge in Microsoft Windows 10 1511, 1607, 1703, and Windows Server 2016 allows an attacker to escape from the AppContainer sandbox, aka "Microsoft Edge Elevation of Privilege Vulnerability". This CVE ID is unique from CVE-2017-8642.
How severe is CVE-2017-8503?: CVE-2017-8503 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-8503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8503?: CVE-2017-8503 affects Microsoft Edge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-8503?: 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-2017-8503 published?: CVE-2017-8503 was published on 2017-08-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:edge:*:*:*:*:*:*:*:*

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