PatchTheCVECVE-2021-3149: On Netshield NANO 25 10.2.18 devices, /usr/local/webmin/System/manual_ping.cgi allows OS command injection (af
CVE-2021-3149 is a high-severity flaw (CVSS 7.2) affecting nano 25 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
On Netshield NANO 25 10.2.18 devices, /usr/local/webmin/System/manual_ping.cgi allows OS command injection (after authentication by the attacker) because the system C library function is used unsafely.
Why this priority
- High severity
- EPSS top 8%: very likely to be exploited
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.2 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | None |
| EPSS exploit chance | 4.5% (top 8%) |
| CISA exploited list | No |
| Weakness | CWE-78 |
| Published | 2021-02-22 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-3149?
nano 25 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-3149 being exploited?
CVE-2021-3149 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-3149 affect?
CVE-2021-3149 affects nano 25 firmware. Severity is high (CVSS 7.2). On Netshield NANO 25 10.2.18 devices, /usr/local/webmin/System/manual_ping.cgi allows OS command injection (after authentication by the attacker) because the system C library function is used unsafely.
How urgent is CVE-2021-3149?
Priority 48/100. High severity; EPSS top 8%: very likely to be exploited