Mitel SIP Phones Argument Injection
CVE-2024-41710 is a high-severity improper neutralization of argument delimiters in a command vulnerability in 6940_sip_firmware from Mitel, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. Affected 6940_sip_firmware versions: 6.4.0.136 and earlier. The record does not name a fixed version, so check the vendor advisory. CISA added it to the Known Exploited Vulnerabilities catalogue on February 12, 2025, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Check which version of 6940_sip_firmware you run against the affected versions below, and install the vendor's latest release.
- CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Read the advisory on mitel.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Mitel | 6940_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6905_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6910_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6915_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6920_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6920w_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6930w_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6940w_sip_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6970_conference_firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6970 Firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6930 Sip Firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6873i Sip Firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6869i Sip Firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6867i Sip Firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6865i Sip Firmware | 6.4.0.136 and earlier | Not stated |
| Mitel | 6863i Sip Firmware | 6.4.0.136 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- HighAdministrator-level access is required first.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.2 | High | NVD |
| CVSS 3.1 | 6.8 | Medium | CISA (ADP) |
Official description
A vulnerability in the Mitel 6800 Series, 6900 Series, and 6900w Series SIP Phones, including the 6970 Conference Unit, through R6.4.0.HF1 (R6.4.0.136) could allow an authenticated attacker with administrative privilege to conduct an argument injection attack, due to insufficient parameter sanitization during the boot process. A successful exploit could allow an attacker to execute arbitrary commands within the context of the system.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Argument Delimiters in a Command
The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.
How developers prevent this class of flaw
- Understand all the potential areas where untrusted inputs can enter your product: parameters or arguments, cookies, anything read from the network, environment variables, request headers as well as content, URL components, e-mail, files, databases, and any external systems that provide data to the application. Perform input validation at well-defined interfaces.
- Directly convert your input type into the expected data type, such as using a conversion function that translates a string into a number. After converting to the expected data type, ensure that the input's values fall within the expected range of allowable values and that multi-field consistencies are maintained.
- When exchanging data between components, ensure that both components are using the same character encoding. Ensure that the proper encoding is applied at each interface. Explicitly set the encoding you are using whenever the protocol allows you to do so.
More Improper Neutralization of Argument Delimiters in a Command vulnerabilities (CWE-88)
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
- Deadline for US federal agencies to remediate, set by CISA.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Third-party and government advisories
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-41710US Government Resource
Technical write-ups (may include proof of concept)
- github.com/kwburns/CVE/blob/main/Mitel/6.3.0.1020/README.mdExploit, Third Party Advisory
Recent Improper Neutralization of Argument Delimiters in a Command vulnerabilities
- 9.9 Critical severity
- 9.8 Critical severity
- 8.8 High severity
- 8.8 High severity
- 7.8 High severity
- 7.2 High severity
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