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CVE-2021-47971— My Notes Safe 5.3 Denial of Service via Buffer Overflow

Quick assessment

Affected
my-notes-safe My Notes Safe
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.

My Notes Safe是GuiWei个人开发者的一款支持加密笔记存储与隐私信息保护的安全记事应用。 My Notes Safe 5.3版本存在安全漏洞，该漏洞源于允许攻击者通过粘贴超长字符串到笔记字段导致拒绝服务，攻击者可生成包含350000个重复字符的有效载荷并两次粘贴到新笔记中触发应用崩溃。

CVSS 7.5 · High EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
my-notes-safe My Notes Safe 5.3 affected
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I. Basic Information for CVE-2021-47971

Vulnerability Information
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Vulnerability Title
My Notes Safe 5.3 Denial of Service via Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
My Notes Safe 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
My Notes Safe是GuiWei个人开发者的一款支持加密笔记存储与隐私信息保护的安全记事应用。 My Notes Safe 5.3版本存在安全漏洞，该漏洞源于允许攻击者通过粘贴超长字符串到笔记字段导致拒绝服务，攻击者可生成包含350000个重复字符的有效载荷并两次粘贴到新笔记中触发应用崩溃。
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
my-notes-safe My Notes Safe 5.3 -

II. Public POCs for CVE-2021-47971

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III. Intelligence Information for CVE-2021-47971

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Vendor Advisories for CVE-2021-47971 (1)

Exploits & Public PoCs for CVE-2021-47971 (1)

IV. Related Vulnerabilities

Same weakness: CWE-789

V. Comments for CVE-2021-47971

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