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CVE-2019-9121

32
FAUCET Score

CVE-2019-9121 is a critical command injection vulnerability affecting Motorola C1 and M2 devices running specific firmware versions. A remote attacker can exploit this flaw by sending crafted HNAP1 POST requests, specifically targeting the SetSmartQoSSettings API function with shell metacharacters in the smartqos_priority_devices field. This allows for arbitrary code execution and obtaining a root shell on the affected devices. While no public exploit code or active exploitation has been confirmed, the vulnerability has garnered significant community discussion, indicating potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
1.07CPE matchmatch criteria
cpe:2.3:o:motorola:m2_firmware:1.07:*:*:*:*:*:*:*
1.01CPE matchmatch criteria
cpe:2.3:o:motorola:c1_firmware:1.01:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.12%
Probability of exploitation in next 30 days
EPSS Percentile
89.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0412 is in the 83rd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / lieanu/vuls/blob/master/motorola/M2_C1/SetSmartQoSSettings.md
Issue TrackingThird Party Advisory