CVE-2021-20233
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I. Basic Information for CVE-2021-20233
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
grub2 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
grub2是GNU社区的一款Linux系统引导程序。 grub2 存在缓冲区错误漏洞，该漏洞源于计算错误而导致堆出界写缺陷。以下产品和版本受到影响：grub2 in versions prior to 2.06。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | grub2 | grub 2.06 | - |
II. Public POCs for CVE-2021-20233
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | This script will remediate the BootHole bug identified in CVE-2020-25632 and/or CVE-2021-20233. | https://github.com/pauljrowland/BootHoleFix | POC Details |
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-20233
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- https://security.netapp.com/advisory/ntap-20220325-0001/x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1926263x_refsource_MISC
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2021-20233
Same Patch Batch · n/a · 2021-03-03 · 36 CVEs total
| CVE-2021-23347 | 4.7 MEDIUM | Cross-site Scripting (XSS) |
| CVE-2020-28597 | Epignosis EfrontPro 安全漏洞 | |
| CVE-2020-25647 | grub2 缓冲区错误漏洞 | |
| CVE-2020-25632 | grub2 资源管理错误漏洞 | |
| CVE-2021-20225 | grub2 缓冲区错误漏洞 | |
| CVE-2020-29047 | WordPress 代码问题漏洞 | |
| CVE-2021-22877 | Nextcloud 访问控制错误漏洞 | |
| CVE-2021-22878 | Nextcloud Server 跨站脚本漏洞 | |
| CVE-2020-8296 | Nextcloud 安全漏洞 | |
| CVE-2021-21978 | VMware View Planner 代码问题漏洞 | |
| CVE-2020-27749 | grub2 缓冲区错误漏洞 | |
| CVE-2020-28591 | Slic3r 缓冲区错误漏洞 | |
| CVE-2020-13558 | WebKitGTK 资源管理错误漏洞 | |
| CVE-2021-22681 | Rockwell Automation RSLogix 500 和 Logix Designer Studio 5000 安全漏洞 | |
| CVE-2021-27839 | Online Invoicing System 注入漏洞 | |
| CVE-2021-27935 | AdGuard 安全漏洞 | |
| CVE-2021-27931 | LumisXP 代码问题漏洞 | |
| CVE-2021-27940 | openark orchestrator 跨站脚本漏洞 | |
| CVE-2021-22666 | FATEK FvDesigner 缓冲区错误漏洞 | |
| CVE-2021-27923 | Pillow 输入验证错误漏洞 |
Showing top 20 of 36 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: grub2
- CVE-2025-54770
Grub2: use-after-free in net_set_vlan - CVE-2025-61664
Grub2: missing unregister call for normal_exit command may l - CVE-2025-61663
Grub2: missing unregister call for normal commands may lead - CVE-2025-61662
Grub2: missing unregister call for gettext command may lead - CVE-2025-61661
Grub2: grub2: out-of-bounds write via malicious usb device
Same vendor: n/a
- CVE-2026-8276
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bettercap zerogod IPP Service zerogod_ipp_primitives.go ippR - CVE-2026-8270
Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
Open5GS SMF smf_nsmf_handle_create_sm_context denial of serv - CVE-2026-8268
Open5GS SMF OpenAPI_list_create denial of service
V. Comments for CVE-2021-20233
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