PatchTheCVECVE-2021-45856: Accu-Time Systems MAXIMUS 1.0 telnet service suffers from a remote buffer overflow which causes the telnet ser
CVE-2021-45856 is a high-severity flaw (CVSS 7.5) affecting maximus firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Accu-Time Systems MAXIMUS 1.0 telnet service suffers from a remote buffer overflow which causes the telnet service to crash
Why this priority
- High severity
- 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 | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.9% (top 20%) |
| CISA exploited list | No |
| Weakness | CWE-120 |
| Published | 2022-01-10 |
| 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-2021-45856?
maximus firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-45856 being exploited?
CVE-2021-45856 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-2021-45856 affect?
CVE-2021-45856 affects maximus firmware. Severity is high (CVSS 7.5). Accu-Time Systems MAXIMUS 1.0 telnet service suffers from a remote buffer overflow which causes the telnet service to crash
How urgent is CVE-2021-45856?
Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action