CVE-2021-27964Sonlogger Unrestricted File Upload
SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload.
Published Mar 4, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-27964 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Sonlogger (Sfcyazilim).
- It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 14, 2023. Public exploit code is available.
- EPSS estimates a 48% probability of exploitation in the next 30 days.
- Fixed versions are available, including Sonlogger 6.4.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
48%
Higher than 98.8% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
51/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 14, 2023
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
3
Proof-of-concept links
In-the-wild evidence
10
Reports of active use
Advisories And Exploit References
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | Oct 14, 2023 | n/a | Not reported |
| Industry KEV feed | Oct 14, 2023 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SonloggerSfcyazilim | See advisory | 6.4.1 |
Patched Releases
Sonlogger
6.4.1
Timeline
Publicly disclosed
Mar 4, 2021
Added to CIRCL KEV
Oct 14, 2023
Added to Industry KEV feed
Oct 14, 2023
Last updated
Nov 21, 2024
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisorysonlogger.com · releasenotes
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
SonLogger before 6.4.1 is affected by Unauthenticated Arbitrary File Upload.
Affected: Sonlogger (Sfcyazilim). The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 14, 2023.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Sonlogger 6.4.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2021-27964 On Your Attack Surface?
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