What’s Vulnerable › Vulnerabilities

CVE-2017-2521

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-05-22 · updated 2026-06-17
• Weakness: CWE-119

Description

An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. Safari before 10.1.1 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

Affected products

• Apple Iphone Os: before 10.3.2 — fixed in 10.3.2
• macOS: before 10.12.5 — fixed in 10.12.5
• Apple tvOS: before 10.2.1 — fixed in 10.2.1
• Apple watchOS: before 3.2.2 — fixed in 3.2.2

How to fix

Upgrade to a fixed version: Apple Iphone Os 10.3.2; macOS 10.12.5; Apple tvOS 10.2.1; Apple watchOS 3.2.2. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/98456
• http://www.securitytracker.com/id/1038487
• https://security.gentoo.org/glsa/201706-15
• https://support.apple.com/HT207798
• https://support.apple.com/HT207800
• https://support.apple.com/HT207801
• https://support.apple.com/HT207804
• https://www.exploit-db.com/exploits/42103/
• http://www.securityfocus.com/bid/98456
• http://www.securitytracker.com/id/1038487
• https://security.gentoo.org/glsa/201706-15
• https://support.apple.com/HT207798

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