CVE Tools
Sign in

CVE-2021-21815

Published: Aug 13, 2021Updated: Nov 21, 2024 Sources: CVE List NVD BDU csafCWE-787
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.3%
Top 75.1%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

Description

A stack-based buffer overflow vulnerability exists in the command-line-parsing HandleFileArg functionality of AT&T Labs' Xmill 0.7. Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to strcpy copying the path provided by the user into a staticly sized buffer without any length checks resulting in a stack-buffer overflow. An attacker can provide malicious input to trigger this vulnerability.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-787

Affected Products

AT&Tn/a
xmillatt
Mixed
Communications / video-conferencing
EcoStruxure Control ExpertSchneider ElectricICS / OT / IoT
SCADAPack RemoteConnectSchneider ElectricICS / OT / IoT
XmillAT&T Labs
On-prem
DevTools & CI / build-test-tools
attcommercialUSCommunicationsaka u-verse firmware, winvnc, xmill
schneider electriccommercialFRICS / OT / IoTaka schneider-electric
at&t labsoss-projectUSDevTools & CI
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1280
talosintelligence.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2022/icsa-22-223-03.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-22-223-03
cisa.gov
and 22 more references View all →

Timeline

Published
Aug 13, 2021
Last Updated
Nov 21, 2024

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-21815 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