{"cve":"CVE-2021-3695","nvd":{"published":"2022-07-06T16:15:08.210","modified":"2026-06-17T04:05:34.667","status":"Modified","description":"A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. 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=1991685","https://security.gentoo.org/glsa/202209-12","https://security.netapp.com/advisory/ntap-20220930-0001/","https://bugzilla.redhat.com/show_bug.cgi?id=1991685","https://security.gentoo.org/glsa/202209-12"],"products":["fedoraproject:fedora","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-2021-3695","score":0.00464,"percentile":0.40206,"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."]}