The remote Debian host is missing a security-related update.
Several vulnerabilities have been discovered in the GRUB2 bootloader. - CVE-2020-10713 A flaw in the grub.cfg parsing code was found allowing to break UEFI Secure Boot and load arbitrary code. Details can be found at https://www.eclypsium.com/2020/07/29/theres-a-hole-in-th e-boot/ - CVE-2020-14308 It was discovered that grub_malloc does not validate the allocation size allowing for arithmetic overflow and subsequently a heap-based buffer overflow. - CVE-2020-14309 An integer overflow in grub_squash_read_symlink may lead to a heap based buffer overflow. - CVE-2020-14310 An integer overflow in read_section_from_string may lead to a heap based buffer overflow. - CVE-2020-14311 An integer overflow in grub_ext2_read_link may lead to a heap-based buffer overflow. - CVE-2020-15706 script: Avoid a use-after-free when redefining a function during execution. - CVE-2020-15707 An integer overflow flaw was found in the initrd size handling. Further detailed information can be found at https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
Upgrade the grub2 packages. For the stable distribution (buster), these problems have been fixed in version 2.02+dfsg1-20+deb10u1.