CVE-2021-40859
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers...
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers with access to the web based management application full administrative access to the device.
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
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers with access to the web based management application full administrative access to the device.
- Record
CVE-2021-40859- 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
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Updated
- 2026-11-02
CVE List No score
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers with access to the web based management application full administrative access to the device.
- Record
CVE-2021-40859- Updated
- 2026-11-02
EUVDEUVD-2021-28015 No score
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers with access to the web based management application full administrative access to the device.
- Record
EUVD-2021-28015- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-69pv-7jmq-p3xp No score
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers...
Backdoors were discovered in Auerswald COMpact 5500R 7.8A and 8.0B devices, that allow attackers with access to the web based management application full administrative access to the device.
- Record
GHSA-69pv-7jmq-p3xp- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Auerswald COMpact 8.0B - Multiple Backdoors | 2021-12-06 |
| Nuclei | Auerswald COMpact 5500R 7.8A and 8.0B Devices Backdoor | |
| PoC in GitHub | 419066074/CVE-2021-40859 | 2021-12-28 |
| PoC in GitHub | pussycat0x/CVE-2021-40859 | 2021-12-29 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, Nuclei, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40859 is a critical vulnerability (CVSS 9.8) in Auerswald Compact 5500r Firmware, published December 7, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 72.0%, the 99th percentile. No source names a fixed version.