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CVE-2021-3695

Quick assessment

Affected
n/a grub2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，攻击者通过精心制作的PNG灰度图像利用该漏洞导致堆中越界写入。

AI Predicted 8.1 Difficulty: Hard EPSS 0.46% · P38
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I. Basic Information for CVE-2021-3695

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
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，攻击者通过精心制作的PNG灰度图像利用该漏洞导致堆中越界写入。
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-2021-3695

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III. Intelligence Information for CVE-2021-3695

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Vendor Advisories for CVE-2021-3695 (3)

Same Patch Batch · n/a · 2022-07-06 · 30 CVEs total

CVE-2022-24141 iTop VPN 安全漏洞
CVE-2022-2318 Linux kernel 资源管理错误漏洞
CVE-2022-32290 Northern.tech Mender 安全漏洞
CVE-2022-30591 quic-go 资源管理错误漏洞
CVE-2022-32386 Tenda AC23 缓冲区错误漏洞
CVE-2022-32385 Tenda AC23 缓冲区错误漏洞
CVE-2022-32383 Tenda AC23 缓冲区错误漏洞
CVE-2021-31676 PESCMS 跨站脚本漏洞
CVE-2021-31677 PESCMS 跨站请求伪造漏洞
CVE-2021-31679 PESCMS 跨站请求伪造漏洞
CVE-2021-31678 PESCMS 跨站请求伪造漏洞
CVE-2022-28935 多款TOTOLINK产品命令注入漏洞
CVE-2022-24138 IOBit Advanced System Care (Asc.exe) 15、Action Download Center 安全漏洞
CVE-2022-24139 IOBit Advanced System Care Free 安全漏洞
CVE-2022-24140 多款IOBit产品安全漏洞
CVE-2021-4234 OpenVPN 安全漏洞
CVE-2022-30929 Mini-Tmall 安全漏洞
CVE-2021-3696 grub2 缓冲区错误漏洞
CVE-2021-3697 grub2 缓冲区错误漏洞
CVE-2022-33737 OpenVPN 日志信息泄露漏洞

Showing top 20 of 30 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: grub2
Same vendor: n/a
Same weakness: CWE-787

V. Comments for CVE-2021-3695

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