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CVE-2021-23424— Regular Expression Denial of Service (ReDoS)

Quick assessment

Affected
n/a ansi-html
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ansi-html是NPM的一个优雅的库，可将粉笔（ANSI）文本转换为 HTML。 ansi-html 0.0.7及之前版本存在安全漏洞，如果攻击者利用该漏洞提供了一个恶意字符串，那么程序将在很长一段时间内卡住而无法处理输入。

CVSS 7.5 · High EPSS 2.02% · P80

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-23424

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service (ReDoS)
Source: CVE Program / CVE List V5
Vulnerability Description
This affects all versions of package ansi-html. If an attacker provides a malicious string, it will get stuck processing the input for an extremely long time.
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
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ansi-html安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ansi-html是NPM的一个优雅的库，可将粉笔（ANSI）文本转换为 HTML。 ansi-html 0.0.7及之前版本存在安全漏洞，如果攻击者利用该漏洞提供了一个恶意字符串，那么程序将在很长一段时间内卡住而无法处理输入。
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
- ansi-html 0 ~ unspecified -

II. Public POCs for CVE-2021-23424

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5735 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2021-23424

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Vendor Advisories for CVE-2021-23424 (2)

Other References for CVE-2021-23424 (1)

Same Patch Batch · n/a · 2021-08-18 · 54 CVEs total

CVE-2021-23425 5.3 MEDIUM Regular Expression Denial of Service (ReDoS)
CVE-2021-21856 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-39268 SuiteCRM 跨站脚本漏洞
CVE-2021-21846 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21851 GPAC 输入验证错误漏洞
CVE-2021-21847 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21845 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-39267 SuiteCRM 跨站脚本漏洞
CVE-2021-21854 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21855 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21853 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21857 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21858 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21825 AT&T Labs Xmill 缓冲区错误漏洞
CVE-2021-21862 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2020-18746 AiteCMS SQL注入漏洞
CVE-2021-37358 SeaCMS SQL注入漏洞
CVE-2021-21867 3s-smart Software Solutions CODESYS Development System 代码问题漏洞
CVE-2021-21868 3s-smart Software Solutions CODESYS Development System 代码问题漏洞
CVE-2021-21781 Linux kernel安全漏洞

Showing top 20 of 54 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same vendor: n/a

V. Comments for CVE-2021-23424

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