Improper Neutralization of Expression/Command Delimiters
CWE-146
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as expression or command delimiters when they are sent to a downstream component.
We track 8 vulnerabilities of this type. 100% are rated high or critical, and the average CVSS score is 8.0.
How this weakness is prevented
- Developers should anticipate that inter-expression and inter-command delimiters will be injected/removed/manipulated in the input vectors of their product. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.
- Implementation: While it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments. The most conservative approach is to escape or filter all characters that do not pass an extremely strict allowlist (such as everything that is not alphanumeric or white space). If some special characters are still needed, such as white space, wrap each argument in quotes after the escaping/filtering step. Be careful of argument injection (CWE-88).
- Implementation: Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
Latest Improper Neutralization of Expression/Command Delimiters vulnerabilities
- 8.8 High severity
PowerProtect Data Manager: Improper Neutralization of Expression/Command Delimiters
Dell PowerProtect Data Manager, version(s) prior to 19.22, contain(s) an Improper Verification of Source of a Communication Channel vulnerability in the REST API. A high privileged attacker with remote access could potentially exploit this vulnerability, leadi
- 8.8 High severity
Apache Commons OGNL: Improper Neutralization of Expression/Command Delimiters
** UNSUPPORTED WHEN ASSIGNED ** Improper Neutralization of Expression/Command Delimiters vulnerability in Apache Commons OGNL. This issue affects Apache Commons OGNL: all versions. When using the API Ognl.getValue, the OGNL engine parses and evaluates the pro
- 9.9 Critical severity
Cisco Adaptive Security Appliance (ASA) Software: Improper Neutralization of Expression/Command Delimiters
A vulnerability in the SSH subsystem of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to execute operating system commands as root. This vulnerability is due to insufficient validation of user input. An attacker
- 7.2 High severity
Cisco Small Business RV Series Router Firmware: Improper Neutralization of Expression/Command Delimiters
A vulnerability in the web-based management interface of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an authenticated, remote attacker to execute arbitrary code on an affected device. In order to exploit this
- 7.2 High severity
Cisco Small Business RV Series Router Firmware: Improper Neutralization of Special Elements used in an OS Command
Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers could allow an authenticated, remote attacker to inject and execute arbitrary commands on the underlying operating system of an
- 7.2 High severity
Cisco Small Business RV Series Router Firmware: Improper Neutralization of Special Elements used in an OS Command
Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV320 and RV325 Dual Gigabit WAN VPN Routers could allow an authenticated, remote attacker to inject and execute arbitrary commands on the underlying operating system of an
- 7.8 High severity
Cisco IOS XE Software: Improper Neutralization of Expression/Command Delimiters
A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands with elevated privileges. This vulnerability is due to insufficient input validation by the system CLI. An attacker with privi
- 7.4 High severity
xdg-utils: Improper Neutralization of Expression/Command Delimiters
When xdg-mail is configured to use thunderbird for mailto URLs, improper parsing of the URL can lead to additional headers being passed to thunderbird that should not be included per RFC 2368. An attacker can use this method to create a mailto URL that looks s