CVE-2009-4128

HIGH 7.2CVE-2009-4128 · Published 01/12/2009 · updated 16/06/2026

In short

CVE-2009-4128 is a HIGH (CVSS 7.2) vulnerability affecting grub 2 (gnu).
Chance of exploitation in the next 30 days (EPSS): 0.57%, higher than 47.4% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
grub 2 gnu	`= 1.97`	No fix yet

Description

GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1.

References

bugs.debian.org/cgi-bin/bugreport.cgi · Exploit
openwall.com/lists/oss-security/2024/01/15/3
securityfocus.com/bid/36968 · Patch
exchange.xforce.ibmcloud.com/vulnerabilities/54210

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