CVE-2017-5392
Weak proxy objects have weak references on multiple threads when they should only have them on one, resulting in incorrect memory usage and corruption, which leads to potentially exploitable crashes.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Weak proxy objects have weak references on multiple threads when they should only have them on one, resulting in incorrect memory usage and corruption, which leads to potentially exploitable crashes. Note: This issue only affects Firefox for Android. Other operating systems are not affected. This vulnerability affects Firefox < 51.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.73% probability · 78th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
EPSS 1.7% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/95763Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037693Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1293709Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-01/Vendor Advisory
- http://www.securityfocus.com/bid/95763Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037693Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1293709Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-01/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.