Public proof of conceptFix available

CVE-2015-8370

A public proof of concept exists; no exploitation attested.

Published2015-12-16
WeaknessCWE-191 · CWE-264

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

Timeline

dates in UTC

2015-12-1621:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-8370?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-8370?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Gnu grub2

Branch	Affected	Fixed in	Source
1.98	= 1.98	no fix published	NVD
1.99	= 1.99	no fix published	NVD
2.0	= 2.00	no fix published	NVD
2.1	= 2.01	no fix published	NVD
2.2	= 2.02	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
23.x	= 23	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.oracle.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionpoc2024-03-06
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.17.42024-10-21
NVDCVSS 2.06.9read 2026-10-23
CISA-ADPweakness (CWE)CWE-1912024-10-21
NVDweakness (CWE)CWE-264read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2015-12-16
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-8370?

Is CVE-2015-8370 actively exploited?

A proof-of-concept exploit exists for CVE-2015-8370, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2015-8370?

CVE-2015-8370 has a CVSS v3 base score of 7.4 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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