CVE-2021-40858

Exp

Auerswald COMpact 5500R devices before 8.2B allow Arbitrary File Disclosure. A sub-admin can read the cleartext Admin password via the fileName=../../etc/passwd substring.

Published: 2021-12-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-40858 is rated High Exploit Risk (63.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.39%). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-40858

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-40858

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.71% 2.39% +0.69%
2 2025-06-08 1.62% 1.71% +0.09%
3 2025-03-30 — 1.62% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-40858

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.2 3.6 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:L/Au:S/C:C/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 6.9 [email protected]

Weakness enumeration for CVE-2021-40858

Affected software / configurations for CVE-2021-40858

Vendor Product Version Raw CPE
auerswald compact_5500r_ip_firmware <= 8.0b cpe:2.3:o:auerswald:compact_5500r_ip_firmware:*:*:*:*:*:*:*:*
auerswald compact_5200r_ip_firmware <= 8.0b cpe:2.3:o:auerswald:compact_5200r_ip_firmware:*:*:*:*:*:*:*:*
auerswald compact_5000r_ip_firmware <= 8.0b cpe:2.3:o:auerswald:compact_5000r_ip_firmware:*:*:*:*:*:*:*:*
auerswald compact_4000_ip_firmware <= 8.0b cpe:2.3:o:auerswald:compact_4000_ip_firmware:*:*:*:*:*:*:*:*
auerswald commander_6000r_ip_firmware <= 8.0b cpe:2.3:o:auerswald:commander_6000r_ip_firmware:*:*:*:*:*:*:*:*
auerswald commander_6000rx_ip_firmware <= 8.0b cpe:2.3:o:auerswald:commander_6000rx_ip_firmware:*:*:*:*:*:*:*:*
auerswald commander_business\(19\"\)_ip_firmware <= 8.0b cpe:2.3:o:auerswald:commander_business\(19\"\)_ip_firmware:*:*:*:*:*:*:*:*
auerswald commander_basic.2\(19\"\)_ip_firmware <= 8.0b cpe:2.3:o:auerswald:commander_basic.2\(19\"\)_ip_firmware:*:*:*:*:*:*:*:*
auerswald compact_5010_voip_ip_firmware <= 8.0b cpe:2.3:o:auerswald:compact_5010_voip_ip_firmware:*:*:*:*:*:*:*:*
auerswald compact_5020_voip_ip_firmware <= 8.0b cpe:2.3:o:auerswald:compact_5020_voip_ip_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-40858

cvelogic Threat Intelligence