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CVE-2025-59689 is a command injection vulnerability in Libraesva Email Security Gateway (ESG) affecting versions 4.5 through 5.5.x before the vendor fixes. The flaw is triggered through a specially crafted compressed email attachment. Available reporting indicates the root cause is improper sanitization during processing intended to remove active code from files contained in certain compressed archive formats, allowing an attacker to bypass sanitization logic and inject shell commands. Successful exploitation results in arbitrary command execution on the ESG appliance in the context of a non-privileged user. The vulnerability has been reported as actively exploited in the wild, including in targeted operations attributed to a nation-state actor.
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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.
58 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A command injection vulnerability in Libraesva Email Security Gateway exploited by state-sponsored threat actors.
A command injection vulnerability in Libraesva Email Security Gateway.
A command injection vulnerability in Libraesva ESG (versions 4.5 to 5.5) allowing attackers to execute shell commands through malicious email attachments.
A vulnerability in Libraesva ESG listed as trending and critical, but no specific details provided in the content.
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.