How severe is CVE-2015-6778?

CVE-2015-6778 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2015-6778 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-2015-6778?

CVE-2015-6778 affects Google Chrome. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-6778?

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

When was CVE-2015-6778 published?

CVE-2015-6778 was published on 2015-12-06 and last updated on 2026-06-17.

CVE-2015-6778

CVE-2015-6778 is a high-severity vulnerability in Google Chrome with a CVSS 2.0 base score of 7.5. 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: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Google Chrome
Published: 2015-12-06
Last modified: 2026-06-17

Description

The CJBig2_SymbolDict class in fxcodec/jbig2/JBig2_SymbolDict.cpp in PDFium, as used in Google Chrome before 47.0.2526.73, allows remote attackers to cause a denial of service (out-of-bounds memory access) or possibly have unspecified other impact via a PDF document containing crafted data with JBIG2 compression.

Frequently asked questions

What is CVE-2015-6778?: The CJBig2_SymbolDict class in fxcodec/jbig2/JBig2_SymbolDict.cpp in PDFium, as used in Google Chrome before 47.0.2526.73, allows remote attackers to cause a denial of service (out-of-bounds memory access) or possibly have unspecified other impact via a PDF document containing crafted data with JBIG2 compression.
How severe is CVE-2015-6778?: CVE-2015-6778 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2015-6778 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-2015-6778?: CVE-2015-6778 affects Google Chrome. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-6778?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-6778 published?: CVE-2015-6778 was published on 2015-12-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*

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