A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Published 2022-07-06 16:15:08
Updated 2023-09-13 16:15:42
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Memory Corruption

Threat overview for CVE-2021-3696

Top countries where our scanners detected CVE-2021-3696
Top open port discovered on systems with this issue 53
IPs affected by CVE-2021-3696 55,107
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-3696!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-3696

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 15 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-3696

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
6.9
MEDIUM AV:L/AC:M/Au:N/C:C/I:C/A:C
3.4
10.0
NIST
4.5
MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
1.0
3.4
NIST

CWE ids for CVE-2021-3696

  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • nvd@nist.gov (Primary)
    • secalert@redhat.com (Secondary)

References for CVE-2021-3696

Products affected by CVE-2021-3696

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