CVE Tools
Sign in

CVE-2021-41524

null pointer dereference in h2 fuzzing

Published: Oct 5, 2021Updated: Nov 21, 2024 Sources: CVE List NVD BDUCWE-476
7.5HIGH
NVD MITRE
EPSS Score
25.0%
Top 2.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Nuclei · OpenVAS

Description

While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-476

Affected Products

Apache Software Foundation
oss-project·USaka apache foundation
Apache HTTP ServerOn-premWeb App
Networking Infrastructure / load-balancer-proxy
АО «ИВК»
commercial·RUaka ivk
Альт 8 СПOn-premOS
Operating Systems / linux-distro
АО «НППКТ»
commercial·RU
ОСОН ОСнова ОnyxOn-premOS
Operating Systems / linux-distro
АО «Концерн ВНИИНС»
commercial·RUaka ao konsern vniins
ОС ОН «Стрелец»On-premOS
Operating Systems / linux-distro
apache
oss-project·USaka apache httpd, apache http server
http serverOn-premWeb App
Networking Infrastructure / load-balancer-proxy
fedoraproject
oss-project·USaka fedora project
fedoraOn-premOS
Operating Systems / linux-distro
and 3 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
Is your org exposed to CVE-2021-41524?We'll check your whole external perimeter for exposure — free. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://httpd.apache.org/security/vulnerabilities_24.html
httpd.apache.org
https://github.com/pld-linux/apache/commit/9ff0bac043c0d5cb3517e7f7ef15a723549dd087
github.com
https://поддержка.нппкт.рф/bin/view/ОСнова/Обновления/2.3/
xn--80ahaefyxhn.xn--j1afgaq.xn--p1ai
and 10 more references View all →
News mentions
Could not load news mentions.

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-41524 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows