Vulnerability Details : CVE-2021-29970

A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
Published 2021-08-05 20:15:09
Updated 2022-12-09 19:05:00
Source Mozilla Corporation
View at NVD,   CVE.org
Vulnerability category: Memory Corruption

Products affected by CVE-2021-29970

Exploit prediction scoring system (EPSS) score for CVE-2021-29970

EPSS FAQ
1.39%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 86 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-29970

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.1
 MEDIUM AV:N/AC:H/Au:N/C:P/I:P/A:P
4.9
6.4
 NIST
8.8
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
2.8
5.9
 NIST

CWE ids for CVE-2021-29970

  • The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
    Assigned by: nvd@nist.gov (Primary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-29970

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