Cyber Resilience

CVE-2021-35977

Critical

Published: 08 October 2021

Published
08 October 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0103 77.7th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-35977 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Digi Realport. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 22.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. This could result in arbitrary code execution.

CWE(s)
CWE-120

Related Threats

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

Affected Assets

digi
realport
≤ 1.9-40 · ≤ 4.8.488.0
digi
connectport ts 8\/16 firmware
all versions
digi
connectport lts 8\/16\/32 firmware
all versions
digi
passport integrated console server firmware
all versions
digi
cm firmware
all versions
digi
portserver ts firmware
all versions
digi
portserver ts mei firmware
all versions
digi
portserver ts mei hardened firmware
all versions
digi
portserver ts m mei firmware
all versions
digi
6350-sr firmware
all versions
+8 more product configuration(s) — see NVD for full list

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