How severe is CVE-2010-0166?

CVE-2010-0166 has a CVSS 2.0 base score of 5.1, rated medium severity.

Is CVE-2010-0166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-0166?

CVE-2010-0166 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2010-0166?

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

When was CVE-2010-0166 published?

CVE-2010-0166 was published on 2010-03-25 and last updated on 2026-06-16.

CVE-2010-0166

CVE-2010-0166 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 5.1. 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-119.

Key facts

Severity: Medium (CVSS 2.0 base score 5.1)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Mozilla Firefox
Published: 2010-03-25
Last modified: 2026-06-16

Description

The gfxTextRun::SanitizeGlyphRuns function in gfx/thebes/src/gfxFont.cpp in the browser engine in Mozilla Firefox 3.6 before 3.6.2 on Mac OS X, when the Core Text API is used, does not properly perform certain deletions, which allows remote attackers to cause a denial of service (memory corruption and application crash) and possibly execute arbitrary code via an HTML document containing invisible Unicode characters, as demonstrated by the U+FEFF, U+FFF9, U+FFFA, and U+FFFB characters.

Frequently asked questions

What is CVE-2010-0166?: The gfxTextRun::SanitizeGlyphRuns function in gfx/thebes/src/gfxFont.cpp in the browser engine in Mozilla Firefox 3.6 before 3.6.2 on Mac OS X, when the Core Text API is used, does not properly perform certain deletions, which allows remote attackers to cause a denial of service (memory corruption and application crash) and possibly execute arbitrary code via an HTML document containing invisible Unicode characters, as demonstrated by the U+FEFF, U+FFF9, U+FFFA, and U+FFFB characters.
How severe is CVE-2010-0166?: CVE-2010-0166 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-2010-0166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-0166?: CVE-2010-0166 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2010-0166?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-0166 published?: CVE-2010-0166 was published on 2010-03-25 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox:3.6:*:*:*:*:*:*:*

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