{"cve":"CVE-2021-3696","nvd":{"published":"2022-07-06T16:15:08.270","modified":"2026-06-17T04:05:34.790","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","score":4.5},"cwes":["CWE-787"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1991686","https://security.gentoo.org/glsa/202209-12","https://security.netapp.com/advisory/ntap-20220930-0001/","https://bugzilla.redhat.com/show_bug.cgi?id=1991686","https://security.gentoo.org/glsa/202209-12"],"products":["gnu:grub2","netapp:ontap_select_deploy_administration_utility","redhat:codeready_linux_builder","redhat:developer_tools","redhat:enterprise_linux","redhat:enterprise_linux_eus","redhat:enterprise_linux_for_power_little_endian","redhat:enterprise_linux_for_power_little_endian_eus","redhat:enterprise_linux_server_aus","redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions","redhat:enterprise_linux_server_tus","redhat:openshift","redhat:openshift_container_platform"],"source":"nvd","synced_at":"2026-10-19T21:33:44.859608815+00:00"},"epss":{"cve":"CVE-2021-3696","score":0.00473,"percentile":0.40905,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}