What’s Vulnerable › Vulnerabilities

CVE-2016-9063

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-10-08
• Weakness: CWE-190

Description

An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.

Affected products

• Debian Linux: 8.0, 9.0, 10.0
• Mozilla Firefox: before 50 — fixed in 50
• Python: from 2.7.0 before 2.7.15; from 3.3.0 before 3.3.7; from 3.4.0 before 3.4.7; from 3.5.0 before 3.5.4; from 3.6.0 before 3.6.2 — fixed in 2.7.15, 3.3.7, 3.4.7, 3.5.4, 3.6.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 50; Python 2.7.15, 3.3.7, 3.4.7, 3.5.4. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/94337
• http://www.securitytracker.com/id/1037298
• http://www.securitytracker.com/id/1039427
• https://bugzilla.mozilla.org/show_bug.cgi?id=1274777
• https://www.debian.org/security/2017/dsa-3898
• https://www.mozilla.org/security/advisories/mfsa2016-89/
• http://www.securityfocus.com/bid/94337
• http://www.securitytracker.com/id/1037298
• http://www.securitytracker.com/id/1039427
• https://bugzilla.mozilla.org/show_bug.cgi?id=1274777
• https://www.debian.org/security/2017/dsa-3898
• https://www.mozilla.org/security/advisories/mfsa2016-89/

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