CVE-2021-36767
In Digi RealPort through 4.8.488.0, authentication relies on a challenge-response mechanism that...
In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.
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
In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.
- Record
CVE-2021-36767- 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-916
- Updated
- 2026-11-02
CVE List No score
In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.
- Record
CVE-2021-36767- Updated
- 2026-11-02
EUVDEUVD-2021-23355 No score
In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.
- Record
EUVD-2021-23355- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-22vf-qc4p-vc3x
In Digi RealPort through 4.8.488.0, authentication relies on a challenge-response mechanism that...
In Digi RealPort through 4.8.488.0, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.
- Record
GHSA-22vf-qc4p-vc3x- 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-916
- 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 firmware
- digi one iap haz firmware
- digi passport integrated console server firmware
- digi portserver ts firmware
- digi portserver ts m 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-2021-36767 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 0.69%, the 52nd percentile. No source names a fixed version.