Vulnerability Details : CVE-2019-9793

A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. *Note: Spectre mitigations are currently enabled for all users by default settings.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
Published 2019-04-26 17:29:02
Updated 2019-05-13 10:29:06
Source Mozilla Corporation
View at NVD,   CVE.org
Vulnerability category: Overflow

Products affected by CVE-2019-9793

Exploit prediction scoring system (EPSS) score for CVE-2019-9793

EPSS FAQ
0.61%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 67 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-9793

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.3
 MEDIUM AV:N/AC:M/Au:N/C:N/I:P/A:N
8.6
2.9
 NIST
5.9
 MEDIUM CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
2.2
3.6
 NIST

CWE ids for CVE-2019-9793

  • The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-9793

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