Buffer overflow in Gnu Grub2
CVE-2021-3695
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. Th…
Vulnerability class: Buffer Overflow
EPSS: 0.005 (37.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.5 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Gnu Grub2
- Netapp Ontap_select_deploy_administration_utility
- Fedoraproject Fedora — versions 36
- Redhat Codeready_linux_builder
- Redhat Developer_tools — versions 1.0
- Redhat Enterprise_linux — versions 8.0, 8.1, 8.4
- Redhat Enterprise_linux_eus — versions 8.2, 8.4, 8.6
- Redhat Enterprise_linux_for_power_little_endian — versions 8.0, 9.0
- Redhat Enterprise_linux_for_power_little_endian_eus — versions 8.2, 8.4, 8.6
- Redhat Enterprise_linux_server_aus — versions 8.2, 8.4, 8.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3695?
- CVE-2021-3695 is a medium-severity vulnerability in Gnu Grub2, classified under Out-of-bounds Write. CVSS score: 4.5/10. Published 2022-07-06.
- How severe is CVE-2021-3695?
- Medium severity. CVSS v3 base score is 4.5 out of 10.
- Is CVE-2021-3695 known to be exploited?
- 19 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.