How severe is CVE-2021-40858?

CVE-2021-40858 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-40858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40858?

CVE-2021-40858 primarily affects Auerswald Compact 5500r Ip Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-40858?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40858 published?

CVE-2021-40858 was published on 2021-12-13 and last updated on 2026-06-17.

CVE-2021-40858

CVE-2021-40858 is a medium-severity vulnerability in Auerswald Compact 5500r Ip Firmware with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 6.8
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Auerswald Compact 5500r Ip Firmware
Published: 2021-12-13
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-40858?: 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.
How severe is CVE-2021-40858?: CVE-2021-40858 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-40858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40858?: CVE-2021-40858 primarily affects Auerswald Compact 5500r Ip Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-40858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40858 published?: CVE-2021-40858 was published on 2021-12-13 and last updated on 2026-06-17.

References

Affected products (10)

cpe:2.3:o:auerswald:compact_5500r_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:compact_5200r_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:compact_5000r_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:compact_4000_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:commander_6000r_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:commander_6000rx_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:commander_business\(19\"\)_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:commander_basic.2\(19\"\)_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:compact_5010_voip_ip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:auerswald:compact_5020_voip_ip_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Auerswald Compact 5500r Ip Firmware

CVE-2021-40857 — High (CVSS 8.8): Auerswald COMpact 5500R devices before 8.2B allow Privilege Escalation via the passwd=1 substring.

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