ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2021-27964

sfcyazilim sonlogger Unrestricted Upload of File with Dangerous Type

Published Jan 22, 2024 · catalog updated Jan 22, 2024 · sfcyazilim sonlogger Unrestricted Upload

Patch now

CVE-2021-27964 is in the CISA known-exploited catalog. Confirm sfcyazilim sonlogger Unrestricted Upload 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 (sfcyazilim sonlogger Unrestricted Upload).
  • 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
47.52%
Remediation
Remediation guidance
Affected products
vendor sfcyazilim sonlogger

SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload. An attacker can send a POST request to /Config/SaveUploadedHotspotLogoFile without any authentication or session header. There is no check for the file extension or content of the uploaded file.

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 sfcyazilim sonloggerversion unspecified

How to fix CVE-2021-27964

What to do

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

Should you patch?

CVE-2021-27964 is in the CISA known-exploited catalog. Confirm sfcyazilim sonlogger Unrestricted Upload 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 47.52%. 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. Jan 22, 2024 · VulnCheck KEV

    Detected

    SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload. An attacker can send a POST request to /Config/SaveUploadedHotspotLogoFile without any authentication or session header. There is no check for the file extension or content of the uploaded file.

  2. Jan 22, 2024 · 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-2021-27964

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-27964

    30-day exploitation probability 47.5%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-27964

    SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload. An attacker can send a POST request to /Config/SaveUploadedHotspotLogoFile without any authentication or session header. There is no check for the file extension or content of the uploaded file.

    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.