CVE-2016-9063
An integer overflow during the parsing of XML using the Expat library.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.36% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- mozilla/firefox · debian/debian linux · python/python
- Source
- security@mozilla.org
EPSS 5.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/94337Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037298Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1274777Issue Tracking, Vendor Advisory
- https://www.debian.org/security/2017/dsa-3898Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-89/Vendor Advisory
- http://www.securityfocus.com/bid/94337Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037298Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1274777Issue Tracking, Vendor Advisory
- https://www.debian.org/security/2017/dsa-3898Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-89/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.