CVE-2021-27964

CriticalPublished

SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload. An attacker can send a POST request to /Config/SaveUploadedHotspotLogoFile...

Published: Mar 5, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: Mar 15, 2021

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

47.5%

Moderate · next 30 days

Percentile: 98.8%
Model date: Oct 18, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Repository evidence: Files: 1 · Repositories: 1

1 Template

SonLogger - Arbitrary File UploadTemplate
http/cves/2021/CVE-2021-27964.yaml
Nuclei Templates
DetectionEvidence observed: Sep 26, 2026Revision: 008731b339bdRelated tool
Declared conditions
- network: http($.protocol_keys)
- verification: dsl($.matchers[*].type)

SonLogger-vulnsPoC
SonLogger Vulns (CVE-2021-27963, CVE-2021-27964)
SonLogger 4.2.3.3 - Unauthenticated Arbitrary File Upload (Metasploit)

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