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Vulnerabilities

Vulnerability · CVE-2021-40856

auerswald comfortel_3600_ip_firmware Use of Incorrectly-Resolved Name or Reference

Published Jun 7, 2025 · catalog updated Jun 7, 2025 · auerswald comfortel_3600_ip_firmware Use of

Patch now

CVE-2021-40856 is in the CISA known-exploited catalog. Confirm auerswald comfortel_3600_ip_firmware Use of against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (auerswald comfortel_3600_ip_firmware Use of).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
50.13%
Remediation
Remediation guidance
Affected products
vendor auerswald comfortel_3600_ip_firmware

Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor auerswald comfortel_3600_ip_firmwareversion unspecified

How to fix CVE-2021-40856

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-40856 is in the CISA known-exploited catalog. Confirm auerswald comfortel_3600_ip_firmware Use of against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 50.13%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 7, 2025 · VulnCheck KEV

    Detected

    Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.

  2. Jun 7, 2025 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-40856

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-40856

    30-day exploitation probability 50.1%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-40856

    Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.