Coverage › CVE-2025-3928

CVE-2025-3928 Mapped Sigma

Commvault Web Server Unspecified Vulnerability

Vendor / product

Commvault — Web Server

Description (CISA)

Commvault Web Server contains an unspecified vulnerability that allows a remote, authenticated attacker to create and execute webshells.

Added to KEV

2025-04-28

Due date

2025-05-19

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Known ransomware use

Unknown

CWE

none recorded by CISA

CISA notes

https://documentation.commvault.com/securityadvisories/CV_2025_03_1.html
https://www.commvault.com/blogs/notice-security-advisory-update
https://nvd.nist.gov/vuln/detail/CVE-2025-3928

Elsewhere

cve.org · NVD · CISA KEV · JSON

ATT&CK techniques · CTID Mappings Explorer, ATT&CK 16.1, KEV snapshot 2025-07-28

2 mapping objects across 2 techniques. exploitation technique states how the vulnerability is exploited; primary and secondary impact state what exploitation achieves. They are different claims and are labelled as such.

Detection chain · ATT&CK Enterprise v19.2 detection strategies, analytics, log sources

T1059 Command and Scripting Interpreter primary impact

• DET0516 Behavioral Detection of Command and Scripting Interpreter Abuse
  AN1428 Windows

  Detects the execution of scripting or command interpreters (e.g., powershell.exe, cmd.exe, wscript.exe) outside expected administrative time windows or from abnormal user contexts, often followed by encoded/obfuscated arguments or secondary execution events.

  WinEventLog:Sysmon EventCode=1 → DC0032 Process Creation

  Tunable: CommandLinePattern ParentProcessName TimeWindow
  AN1429 Linux

  Detects use of shell interpreters (e.g., bash, sh, python, perl) initiated by users or processes not normally executing them, especially when chaining suspicious utilities like netcat, curl, or ssh.

  auditd:SYSCALL execve → DC0032 Process Creation

  Tunable: InterpreterName UserContext ExecutionChainLength
  AN1430 macOS

  Detects launch of command-line interpreters via Terminal, Automator, or hidden osascript, especially when parent process lineage deviates from user-initiated applications.

  macos:unifiedlog log stream --info --predicate 'eventMessage CONTAINS "exec"' → DC0032 Process Creation

  Tunable: LaunchAgentName ScriptName TerminalAppUsage
  AN1431 ESXi

  Detects use of 'esxcli system' or direct interpreter commands (e.g., busybox shell) invoked from SSH or host terminal unexpectedly.

  esxi:vobd shell session start → DC0064 Command Execution

  Tunable: ShellEnabledFlag SSHContext
  AN1432 Network Devices

  Identifies CLI interpreter access (e.g., Cisco IOS, Juniper JUNOS) via enable mode or scripting-capable sessions used by uncommon accounts or from unknown IPs.

  networkdevice:cli shell command → DC0064 Command Execution

  networkdevice:syslog authentication & authorization → DC0002 User Account Authentication

  Tunable: UserRole DeviceType

Sigma rules tagged attack.t1059 (95)

All 95 rules on the technique page →

T1505.003 Web Shell secondary impact

• DET0394 Web Shell Detection via Server Behavior and File Execution Chains
  AN1108 Windows

  Unexpected file creation in web directories followed by web server processes (e.g., w3wp.exe) spawning command shells or script interpreters (e.g., cmd.exe, powershell.exe)

  WinEventLog:Sysmon EventCode=11 → DC0039 File Creation

  WinEventLog:Sysmon EventCode=1 → DC0032 Process Creation

  WinEventLog:Security EventCode=4624, 4648 → DC0067 Logon Session Creation

  NSM:Flow Inbound HTTP POST with suspicious payload size or user-agent → DC0085 Network Traffic Content

  Tunable: WebRootPath ParentProcess
  AN1109 Linux

  File creation of unauthorized script (e.g., .php, .sh) in /var/www/html followed by execution of unexpected system utilities (e.g., curl, bash, nc) by apache/nginx

  auditd:SYSCALL new file created in /var/www/html, /srv/http, or similar web root → DC0039 File Creation

  auditd:SYSCALL apache2 or nginx spawning sh, bash, or python interpreter → DC0032 Process Creation

  NSM:Flow POST requests to .php, .jsp, .aspx files with high entropy body → DC0085 Network Traffic Content

  Tunable: WebRootPath PayloadEntropyThreshold TimeWindow
  AN1110 macOS

  Web servers (e.g., httpd) spawning abnormal processes post file upload into /Library/WebServer/Documents or /usr/local/var/www

  macos:unifiedlog httpd spawning bash, zsh, python, or osascript → DC0032 Process Creation

  auditd:SYSCALL file write operations in /Library/WebServer/Documents → DC0061 File Modification

  Tunable: InterpreterName ExecutionParent

Sigma rules tagged attack.t1505.003 (35)

All 35 rules on the technique page →