CVE-2021-40438
mod_proxy SSRF
Description
Multiple vulnerabilities were identified in the Apache HTTP Server software. These include NULL Pointer Dereferencing, Out-of-bounds Write and Server-Side Request Forgery related vulnerabilities. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not, or not yet available.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:HConfidentialityHigh
I:HIntegrityHigh
A:HAvailabilityHigh
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka redhat, red hat
oracle
commercial·USaka oracle corp.
siemens
commercial·DEaka siemens ag
АО «НТЦ ИТ РОСА»
commercial·RU
netapp
commercial·US
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
and 28 more affected products View all →
Exploitability
CISA Known Exploited Vulnerability
Added to KEV:Dec 1, 2021
Remediation due:Dec 15, 2021
Ransomware:Known ransomware use
Required action: Apply updates per vendor instructions.
Official Patch Available
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 Command and Control
Initial Access
References
https://cert-portal.siemens.com/productcert/csaf/ssa-685781.json
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/txt/ssa-685781.txt
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
cert-portal.siemens.com
and 49 more references View all →
Unlock Complete Vulnerability Intelligence
Get the full picture for CVE-2021-40438 and every CVE in our database. Create a free account — no credit card required.
Create Free AccountPlain-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