PatchTheCVECVE-2020-12493: An open port used for debugging in SWARCOs CPU LS4000 Series with versions starting with G4..
CVE-2020-12493 is a critical-severity flaw (CVSS 10.0) affecting cpu ls4000 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An open port used for debugging in SWARCOs CPU LS4000 Series with versions starting with G4... grants root access to the device without access control via network. A malicious user could use this vulnerability to get access to the device and disturb operations with connected devices.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 10.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.4% (top 27%) |
| CISA exploited list | No |
| Weakness | CWE-284 |
| Published | 2020-05-29 |
| 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-2020-12493?
cpu ls4000 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2020-12493 being exploited?
CVE-2020-12493 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-2020-12493 affect?
CVE-2020-12493 affects cpu ls4000 firmware. Severity is critical (CVSS 10.0). An open port used for debugging in SWARCOs CPU LS4000 Series with versions starting with G4... grants root access to the device without access control via network. A malicious user could use this vulnerability to get access to the device an
How urgent is CVE-2020-12493?
Priority 58/100. Critical severity; Remotely exploitable, no login, no user action