CVE-2021-3418
Last modified
CVE-2021-3418 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
Description
If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.
Metrics
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Grub2 | < 2.06 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1933757Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1933757Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3418?
How severe is CVE-2021-3418?
How do I fix CVE-2021-3418?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-34166A SQL INJECTION vulnerability in Sourcecodester Simple Food …9.8
- CVE-2021-34167Cross Site Request Forgery (CSRF) vulnerability in taoCMS 3.…8.8
- CVE-2021-3417An internal product security audit of LXCO, prior to version…4.9
- CVE-2021-34170Bandai Namco FromSoftware Dark Souls III allows remote attac…9.8
- CVE-2021-34173An attacker can cause a Denial of Service and kernel panic i…7.5
- CVE-2021-34174A vulnerability exists in Broadcom BCM4352 and BCM43684 chip…4.6
- CVE-2021-34181Cross Site Scripting (XSS) vulnerability in TomExam 3.0 via …5.4
- CVE-2021-34182An issue in ttyd v.1.6.3 allows attacker to execute arbitrar…9.8
- CVE-2021-34183Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
- CVE-2021-34184Miniaudio 0.10.35 has a Double free vulnerability that could…9.8
- CVE-2021-34185Miniaudio 0.10.35 has an integer-based buffer overflow cause…7.8
- CVE-2021-34187main/inc/ajax/model.ajax.php in Chamilo through 1.11.14 allo…9.8
Are you affected by CVE-2021-3418?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST