Vulnerability Details : CVE-2021-3420

A flaw was found in newlib in versions prior to 4.0.0. Improper overflow validation in the memory allocation functions mEMALIGn, pvALLOc, nano_memalign, nano_valloc, nano_pvalloc could case an integer overflow, leading to an allocation of a small buffer and then to a heap-based buffer overflow.
Published 2021-03-05 21:15:13
Updated 2021-03-24 18:00:50
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Overflow

Exploit prediction scoring system (EPSS) score for CVE-2021-3420

EPSS FAQ
0.61%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 76 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3420

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.5
 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
 NIST
9.8
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
 NIST

CWE ids for CVE-2021-3420

  • The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.
    Assigned by: secalert@redhat.com (Primary)
  • The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
    Assigned by: secalert@redhat.com (Primary)

References for CVE-2021-3420

Products affected by CVE-2021-3420

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