CVE-2015-8370

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.09% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 63.2% of scored records. A rank, not a probability.

NVD base score

7.4 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2015-12-16 00:00Z10 YR AGO

Last updated

2024-10-21 16:51Z1 YR AGO

Reserved

2015-11-27

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.4)

CNA CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-191Integer Underflow (Wrap or Wraparound)Base
• CWE-264
• CWE-787Out-of-bounds WriteBase

Data version

5.1

Document digest

d40bff49aec4a66dbcb942650a5f1d8816f7ebdb9bf65f1a685c1fffa416da83

• packetstormsecurity.comhttp://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
• lists.opensuse.orgopenSUSE-SU-2015:2392http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.htmlvendor-advisory
• lists.opensuse.orgopenSUSE-SU-2016:0036http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.htmlvendor-advisory
• hmarco.orghttp://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
• www.securityfocus.com79358http://www.securityfocus.com/bid/79358vdb-entry
• lists.opensuse.orgopenSUSE-SU-2015:2375http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.htmlvendor-advisory
• www.securitytracker.com1034422http://www.securitytracker.com/id/1034422vdb-entry
• www.oracle.comhttp://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
• lists.opensuse.orgSUSE-SU-2015:2387http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.htmlvendor-advisory
• lists.opensuse.orgSUSE-SU-2015:2386http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.htmlvendor-advisory
• www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
• www.openwall.com[oss-security] 20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]http://www.openwall.com/lists/oss-security/2015/12/15/6mailing-list
• www.securityfocus.com20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]http://www.securityfocus.com/archive/1/537115/100/0/threadedmailing-list
• lists.opensuse.orgSUSE-SU-2015:2385http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.htmlvendor-advisory
• seclists.org20151216 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]http://seclists.org/fulldisclosure/2015/Dec/69mailing-list
• security.gentoo.orgGLSA-201512-03https://security.gentoo.org/glsa/201512-03vendor-advisory
• lists.fedoraproject.orgFEDORA-2015-cebe5133e7http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.htmlvendor-advisory
• www.ubuntu.comUSN-2836-1http://www.ubuntu.com/usn/USN-2836-1vendor-advisory
• lists.fedoraproject.orgFEDORA-2015-90c27b6e91http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.htmlvendor-advisory
• rhn.redhat.comRHSA-2015:2623http://rhn.redhat.com/errata/RHSA-2015-2623.htmlvendor-advisory
• lists.opensuse.orgSUSE-SU-2015:2399http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.htmlvendor-advisory
• www.debian.orgDSA-3421http://www.debian.org/security/2015/dsa-3421vendor-advisory
• www.openwall.com[oss-security] 20240116 CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot managerhttp://www.openwall.com/lists/oss-security/2024/01/15/3mailing-list