Which products and versions are affected by CVE-2021-40859?

Affected: Compact 5500r Firmware (Auerswald) versions 7.8a-build002, 8.0b-build000. The full list is in the CVE brief.

Is CVE-2021-40859 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-40859 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-40859?

Public exploit code is available.

Is there a fix for CVE-2021-40859?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-40859 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2021-40859

CriticalPublic exploit

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.

Published Dec 7, 2021 · Updated Nov 21, 2024

Key Facts

Patch immediately

CVE-2021-40859 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Compact 5500r Firmware (Auerswald).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 72% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

72%

Higher than 99.4% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2021-40859 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Compact 5500r FirmwareAuerswald	7.8a-build002, 8.0b-build000	n/a

Timeline

Publicly disclosed
Dec 7, 2021
Last updated
Nov 21, 2024

References

FAQ

Common Questions.

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.
Affected: Compact 5500r Firmware (Auerswald) versions 7.8a-build002, 8.0b-build000. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2021-40859 Running On Your Attack Surface?

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