How severe is CVE-2012-5851?

CVE-2012-5851 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2012-5851 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-5851?

CVE-2012-5851 primarily affects Apple Webkit. In total, 62 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-5851?

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

When was CVE-2012-5851 published?

CVE-2012-5851 was published on 2012-11-15 and last updated on 2026-06-16.

CVE-2012-5851

CVE-2012-5851 is a medium-severity vulnerability in Apple Webkit with a CVSS 2.0 base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Apple Webkit
Published: 2012-11-15
Last modified: 2026-06-16

Description

html/parser/XSSAuditor.cpp in WebCore in WebKit, as used in Google Chrome through 22 and Safari 5.1.7, does not consider all possible output contexts of reflected data, which makes it easier for remote attackers to bypass a cross-site scripting (XSS) protection mechanism via a crafted string, aka rdar problem 12019108.

Frequently asked questions

What is CVE-2012-5851?: html/parser/XSSAuditor.cpp in WebCore in WebKit, as used in Google Chrome through 22 and Safari 5.1.7, does not consider all possible output contexts of reflected data, which makes it easier for remote attackers to bypass a cross-site scripting (XSS) protection mechanism via a crafted string, aka rdar problem 12019108.
How severe is CVE-2012-5851?: CVE-2012-5851 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2012-5851 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-5851?: CVE-2012-5851 primarily affects Apple Webkit. In total, 62 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-5851?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-5851 published?: CVE-2012-5851 was published on 2012-11-15 and last updated on 2026-06-16.

References

Affected products (62)

cpe:2.3:a:apple:webkit:*:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.1:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.2:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.3:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.4:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.6:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.7:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.8:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.9:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.10:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.11:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.12:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.14:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.16:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.17:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.18:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.20:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.21:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.22:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.23:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.24:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.25:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.26:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.27:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.28:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.29:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.31:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.32:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.33:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.35:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.36:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.37:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.39:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.48:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.49:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.50:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.51:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:22.0.1229.52:*:*:*:*:*:*:*

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