Is CVE-2015-8370 in the CISA KEV catalog?

No. CVE-2015-8370 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8370?

CVE-2015-8370 has a CVSS v3 base score of 7.4 (HIGH).

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

CVE-2015-8370 has an EPSS score of 1.10% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8370?

Upgrade grub2 on debian 11 to 2.02~beta2-33 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2015-8370

HIGH

7.4

CVSS v3

NVD

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.

CWE-264Permissions, Privileges, and Access Controls CWE-191

How to fix

Remediation Available

grub2Debian

Fixed in:2.02~beta2-33CVE-2015-8370

grub2Ubuntu

Fixed in:2.02~beta2-9ubuntu1.6USN-2836-1

grub2-commonUbuntu

Fixed in:2.02~beta2-9ubuntu1.6USN-2836-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.10%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2012-1456	Medium	4.3	100%	-	-
CVE-2012-1459	Medium	4.3	100%	-	Fix
CVE-2012-1446	Medium	4.3	100%	-	-
CVE-2012-1443	Medium	4.3	100%	-	-
CVE-2012-1442	Medium	4.3	99%	-	-
CVE-2012-1457	Medium	4.3	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.