CVE intelligence and bounded remediation
CVE-2016-5270 — Mozilla Firefox security vulnerability
Critical
CVSS 9.8
Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.
- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Published
- 2016-09-22
- CISA KEV
- Not currently listed
- Ecosystem
- browser
- Weaknesses
- CWE-119, CWE-787
Affected products
- mozilla / firefox
- mozilla / firefox / 45.1.0
- mozilla / firefox / 45.1.1
- mozilla / firefox / 45.2.0
- mozilla / firefox / 45.3.0
Matched remediation archetype
Buffer bounds, memory safety, and memory corruption
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
- Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
- Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.
Remediate safely
- Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
- Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
- Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.
Authoritative sources
Complete CVE record and remediation plan
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