CVE-2021-35977
An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-35977- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-35977- Updated
- 2026-11-02
EUVDEUVD-2021-22610 No score
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.
- Record
EUVD-2021-22610- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g5mc-mhmx-jqjp
An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists...
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.
- Record
GHSA-g5mc-mhmx-jqjp- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
Affected products
- digi realport
- digi 6350-sr firmware
- digi cm firmware
- digi connect es firmware
- digi connectport lts 8\/16\/32 firmware
- digi connectport ts 8\/16 firmware
- digi one ia firmware
- digi one iap family firmware
- digi passport integrated console server firmware
- digi portserver ts firmware
- digi portserver ts m mei firmware
- digi portserver ts mei firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-35977 is a critical vulnerability (CVSS 9.8) in Digi Realport, published October 8, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.58%, the 75th percentile. No source names a fixed version.