Loading vulnerability…
CVE-2020-28871 is a critical remote code execution vulnerability in Monitorr v1.7.6m, a web application for monitoring website uptime. The vulnerability exists in upload.php, which fails to properly validate uploaded files, allowing unauthenticated attackers to upload files containing arbitrary PHP code. Attackers can disguise PHP payloads as images (e.g., using GIF magic bytes) to bypass superficial checks and achieve code execution on the server. The flaw is present in the default configuration and affects all known versions of Monitorr. No official patch is available, and the project appears abandoned.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module targeting CVE-2020-28871, an unauthenticated remote code execution vulnerability in Monitorr (versions 1.7.6m, 1.7.7d, and below). The exploit abuses a file upload vulnerability in 'upload.php' to upload a PHP webshell disguised as a GIF image. After successful upload, the webshell is accessed via the '/assets/data/usrimg/' directory, allowing arbitrary code execution on the server. The module supports multiple payloads and platforms, including PHP, Unix, Linux, and Windows, and can deliver reverse shells or Meterpreter sessions. The exploit is fully weaponized, leveraging Metasploit's payload and session management capabilities. The main endpoints involved are the vulnerable upload handler and the location where the webshell is stored and executed. The repository is structured as a single Ruby file within the Metasploit framework's exploit modules directory.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.