How severe is CVE-2009-1686?

CVE-2009-1686 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-1686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1686?

CVE-2009-1686 primarily affects Apple Safari. In total, 34 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1686?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-1686 published?

CVE-2009-1686 was published on 2009-06-10 and last updated on 2026-06-16.

CVE-2009-1686

CVE-2009-1686 is a critical-severity vulnerability in Apple Safari with a CVSS 2.0 base score of 9.3. 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-20.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Apple Safari
Published: 2009-06-10
Last modified: 2026-06-16

Description

WebKit in Apple Safari before 4.0, iPhone OS 1.0 through 2.2.1, and iPhone OS for iPod touch 1.1 through 2.2.1 does not properly handle constant (aka const) declarations in a type-conversion operation during JavaScript exception handling, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted HTML document.

Frequently asked questions

What is CVE-2009-1686?: WebKit in Apple Safari before 4.0, iPhone OS 1.0 through 2.2.1, and iPhone OS for iPod touch 1.1 through 2.2.1 does not properly handle constant (aka const) declarations in a type-conversion operation during JavaScript exception handling, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted HTML document.
How severe is CVE-2009-1686?: CVE-2009-1686 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-1686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1686?: CVE-2009-1686 primarily affects Apple Safari. In total, 34 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1686?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-1686 published?: CVE-2009-1686 was published on 2009-06-10 and last updated on 2026-06-16.

References

Affected products (34)

cpe:2.3:a:apple:safari:*:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:0.8:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:0.9:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.0.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.3.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:1.3.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:2.0.4:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.4:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.2:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2.3:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:*:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.1:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.2:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.3:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.0.4:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.1:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.1.2:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2.1:-:mac:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2.1:-:windows:*:*:*:*:*
cpe:2.3:a:apple:safari:3.2.2:-:windows:*:*:*:*:*

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