CVE-2018-4277

HIGHNVD 7.57.5—

7.5

In iOS before 11.4.1, watchOS before 4.3.2, tvOS before 11.4.1, Safari before 11.1.1, macOS High Sierra before 10.13.6, a spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 67.6%
KEV: Not listed

Published

January 11, 2019

Last Modified

November 21, 2024

References (12)

product-security@applehttp://www.securitytracker.com/id/1041232
product-security@applehttps://support.apple.com/HT208854
product-security@applehttps://support.apple.com/HT208935
product-security@applehttps://support.apple.com/HT208936
product-security@applehttps://support.apple.com/HT208937
product-security@applehttps://support.apple.com/HT208938
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1041232
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT208854
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT208935
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT208936
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT208937
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/HT208938

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-20Improper Input Validation

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-4277?

CVE-2018-4277 is a high vulnerability published on January 11, 2019. In iOS before 11.4.1, watchOS before 4.3.2, tvOS before 11.4.1, Safari before 11.1.1, macOS High Sierra before 10.13.6, a spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

When was CVE-2018-4277 disclosed?

CVE-2018-4277 was first published in the National Vulnerability Database on January 11, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-4277 actively exploited?

CVE-2018-4277 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-4277?

CVE-2018-4277 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-4277?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-4277, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-4277

📅 Published

🔄 Last Modified

🔗 References (12)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-4277?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (12)

Frequently asked(5)

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