How severe is CVE-2015-5839?

CVE-2015-5839 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-5839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-5839?

CVE-2015-5839 primarily affects Apple Watchos. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-5839?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-5839 published?

CVE-2015-5839 was published on 2015-09-18 and last updated on 2026-06-17.

CVE-2015-5839

CVE-2015-5839 is a medium-severity vulnerability in Apple Watchos with a CVSS 2.0 base score of 5.0. 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-254.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Apple Watchos
Published: 2015-09-18
Last modified: 2026-06-17

Description

dyld in Apple iOS before 9 allows attackers to bypass a code-signing protection mechanism via an app that places a crafted signature in an executable file.

Frequently asked questions

What is CVE-2015-5839?: dyld in Apple iOS before 9 allows attackers to bypass a code-signing protection mechanism via an app that places a crafted signature in an executable file.
How severe is CVE-2015-5839?: CVE-2015-5839 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-5839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-5839?: CVE-2015-5839 primarily affects Apple Watchos. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-5839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-5839 published?: CVE-2015-5839 was published on 2015-09-18 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:apple:watchos:1.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*

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