CVE•Published 2021-09-16•Modified 2026-08-05•1 article on news•6 live references•NVD data
CVE-2021-40438Resf · Rocky_linux
Vulnerability data via NVD (ingested)
CVSS v3.1
9.0
CRITICAL
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
100
Exploit Prediction Scoring System · top 0% of all CVEs
Weaknesses (CWE)
Description
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.
Timeline
Published 2021-09-16
Modified 2026-08-05
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag2,707,181 hosts
vuln:CVE-2021-40438Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · OS
os:"Rocky Linux"Hosts Shodan identified as running Rocky Linux.
More intel sources (5)
Shodan report
vuln:CVE-2021-40438Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-40438Censys host search filtered to this CVE id.
grep.app
CVE-2021-40438Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-40438GitHub code search for direct mentions.
Google dork
"CVE-2021-40438" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (7)
CVE-2021-404387 repos
Threekiii/Awesome-POCJava
一个漏洞 PoC 知识库。A knowledge base for vulnerability PoCs(Proof of Concept), with 1k+ vulnerabilities.
vulnersCom/nmap-vulnersLua
Nmap NSE scripts that turn a service scan into CVEs, CVSS scores and known exploits — fingerprints software from HTTP responses and checks every detected CPE against the Vulners da…
Ostorlab/KEVunknown
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
Awrrays/FrameVulunknown
POC集合，框架nday漏洞利用
ARPSyndicate/cve-scoresunknown
EPSS & VEDAS Score Aggregator for CVEs
4ra1n/poc-runnerGo
Small & Fast Vulnerability Scanner Engine based on XRAY YAML Rule | 基于 XRAY YAML 规则的超轻量快速漏洞扫描引擎 | 基于 ANTLR 实现语法分析和完整的 XRAY YAML 规则实现 | 简单的启动参数 | 包含多种反连可用 | 可执行文件体积仅 2 MB
CLincat/vulcatPython
vulcat可用于扫描Web端常见的CVE、CNVD等编号的漏洞，发现漏洞时会返回Payload信息。部分漏洞还支持命令行交互模式，可以持续利用漏洞