PatchTheCVECVE-2020-27386: An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to up
CVE-2020-27386 is a high-severity flaw (CVSS 8.8) affecting flexdotnetcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to upload and execute arbitrary files by using the FileManager to upload malicious code (e.g., ASP code) in the form of a safe file type (e.g., a TXT file), and then using the FileEditor (in v1.5.8 and prior) or the FileManager's rename function (in v1.5.7 and prior) to rename the file to an executable extension (e.g., ASP), and finally execut
Why this priority
- High severity
- EPSS top 1%: very likely to be exploited
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 72.1% (top 1%) |
| CISA exploited list | No |
| Weakness | CWE-434 |
| Published | 2020-11-12 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Metasploit: FlexDotnetCMS Arbitrary ASP File Upload
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-27386?
flexdotnetcms: upgrade to 1.5.9. Exact commands for each OS are on this page.
Is CVE-2020-27386 being exploited?
CVE-2020-27386 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-27386 affect?
CVE-2020-27386 affects flexdotnetcms. Severity is high (CVSS 8.8). An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to upload and execute arbitrary files by using the FileManager to upload malicious code (e.g., ASP code) in the form of a safe file typ
How urgent is CVE-2020-27386?
Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference
Related CVEs
- CVE-2020-27385 HIGH 8.1 UPGRADE Incorrect Access Control in the FileEditor (/Admin/Views/FileEditor/) in FlexDotnetCMS before v1.5.11 allows a