Cyber Resilience

CVE-2021-45856

HighPublic PoC

Published: 10 January 2022

Published
10 January 2022
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0073 73.2th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-45856 is a high-severity Classic Buffer Overflow (CWE-120) vulnerability in Accu-Time Maximus Firmware. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 26.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

Accu-Time Systems MAXIMUS 1.0 telnet service suffers from a remote buffer overflow which causes the telnet service to crash

CWE(s)
CWE-120

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

accu-time
maximus firmware
1.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-120

Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.

References