CVE-2021-3696

moderate-risk
Published 2022-07-06

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.

Do I need to act?

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0.11% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.5/10 Medium
LOCAL / HIGH complexity

Affected Products (20)

Developer Tools

Affected Vendors

Redhat Gnu Netapp

References (6)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1991686
Third Party Advisory https://security.gentoo.org/glsa/202209-12
Third Party Advisory https://security.netapp.com/advisory/ntap-20220930-0001/
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1991686
Third Party Advisory https://security.gentoo.org/glsa/202209-12
Third Party Advisory https://security.netapp.com/advisory/ntap-20220930-0001/
35
/ 100
moderate-risk
Severity 12/34 · Low
Exploitability 0/34 · Minimal
Exposure 23/34 · High