CVE-2020-27386
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 72.1%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
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 executing the file via an HTTP GET request to /<path_to_file>.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 72.08% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-434
- Affected
- flexdotnetcms project/flexdotnetcms
- Source
- cve@mitre.org
EPSS 72.1% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://packetstormsecurity.com/files/160411/FlexDotnetCMS-1.5.8-Arbitrary-ASP-File-Upload.htmlThird Party Advisory, VDB Entry
- https://blog.vonahi.io/whats-in-a-re-name/Exploit, Third Party Advisory
- https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.9Release Notes, Third Party Advisory
- https://github.com/rapid7/metasploit-framework/pull/14339Exploit, Patch, Third Party Advisory
- http://packetstormsecurity.com/files/160411/FlexDotnetCMS-1.5.8-Arbitrary-ASP-File-Upload.htmlThird Party Advisory, VDB Entry
- https://blog.vonahi.io/whats-in-a-re-name/Exploit, Third Party Advisory
- https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.9Release Notes, Third Party Advisory
- https://github.com/rapid7/metasploit-framework/pull/14339Exploit, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.