How severe is CVE-2010-0169?

CVE-2010-0169 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2010-0169 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-0169?

CVE-2010-0169 primarily affects Mozilla Firefox. In total, 85 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-0169?

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

When was CVE-2010-0169 published?

CVE-2010-0169 was published on 2010-03-25 and last updated on 2026-06-16.

CVE-2010-0169

CVE-2010-0169 is a medium-severity vulnerability in Mozilla Firefox 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.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mozilla Firefox
Published: 2010-03-25
Last modified: 2026-06-16

Description

The CSSLoaderImpl::DoSheetComplete function in layout/style/nsCSSLoader.cpp in Mozilla Firefox 3.0.x before 3.0.18, 3.5.x before 3.5.8, and 3.6.x before 3.6.2; Thunderbird before 3.0.2; and SeaMonkey before 2.0.3 changes the case of certain strings in a stylesheet before adding this stylesheet to the XUL cache, which might allow remote attackers to modify the browser's font and other CSS attributes, and potentially disrupt rendering of a web page, by forcing the browser to perform this erroneous stylesheet caching.

Frequently asked questions

What is CVE-2010-0169?: The CSSLoaderImpl::DoSheetComplete function in layout/style/nsCSSLoader.cpp in Mozilla Firefox 3.0.x before 3.0.18, 3.5.x before 3.5.8, and 3.6.x before 3.6.2; Thunderbird before 3.0.2; and SeaMonkey before 2.0.3 changes the case of certain strings in a stylesheet before adding this stylesheet to the XUL cache, which might allow remote attackers to modify the browser's font and other CSS attributes, and potentially disrupt rendering of a web page, by forcing the browser to perform this erroneous stylesheet caching.
How severe is CVE-2010-0169?: CVE-2010-0169 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2010-0169 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-0169?: CVE-2010-0169 primarily affects Mozilla Firefox. In total, 85 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-0169?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-0169 published?: CVE-2010-0169 was published on 2010-03-25 and last updated on 2026-06-16.

References

Affected products (85)

cpe:2.3:a:mozilla:firefox:3.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.10:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.11:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.12:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.13:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.14:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.15:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.16:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.17:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.5.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1:alpha:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1:beta:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.5:1.1.10:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.6:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.7:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.8:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.9:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.10:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.11:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.12:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.13:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.14:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.15:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:1.1.16:*:*:*:*:*:*:*

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