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CVE-2021-20617 is an improper access control and OS command injection vulnerability in the initialization functionality of acmailer 4.0.1 and earlier and acmailer DB 1.1.3 and earlier. The issue is present in init_ctl.cgi, where the application processes a POST request parameter, sendmail_path, and passes it unsafely into a shell command equivalent to ls -l $FORM{sendmail_path}. Because the parameter is not safely handled, a remote attacker can inject shell metacharacters and execute arbitrary OS commands on the underlying host. The available analysis indicates the flaw is exploitable without authentication as long as init_ctl.cgi remains accessible on the deployed server.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.