PatchTheCVECVE-2009-5156: An issue was discovered on ASMAX AR-804gu 66.34.1 devices
CVE-2009-5156 is a critical-severity flaw (CVSS 9.8) affecting asmax ar-804gu firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered on ASMAX AR-804gu 66.34.1 devices. There is Command Injection via the cgi-bin/script query string.
Why this priority
- Critical severity
- EPSS top 4%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 10.9% (top 4%) |
| CISA exploited list | No |
| Weakness | CWE-77 |
| Published | 2019-06-11 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · 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-2009-5156?
asmax ar-804gu firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2009-5156 being exploited?
CVE-2009-5156 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-2009-5156 affect?
CVE-2009-5156 affects asmax ar-804gu firmware. Severity is critical (CVSS 9.8). An issue was discovered on ASMAX AR-804gu 66.34.1 devices. There is Command Injection via the cgi-bin/script query string.
How urgent is CVE-2009-5156?
Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action