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CVE-2026-40140 is a high-severity, pre-authentication vulnerability affecting BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) versions 25.3.2 and earlier. The flaw is in the network communication subsystem and is caused by insufficient validation of client-supplied input. A remote, unauthenticated attacker can send crafted input to the affected subsystem before authentication and trigger a denial-of-service condition, resulting in loss of appliance availability. The provided material does not identify a specific vulnerable function.
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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.
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A high-severity pre-authentication denial-of-service vulnerability in the network communication subsystem of affected BeyondTrust products that could let attackers disrupt service availability.
A pre-authentication denial-of-service vulnerability in the network communication subsystem of BeyondTrust appliances caused by insufficient validation of client-supplied input.
A high-severity BeyondTrust RS/PRA vulnerability that can be exploited to trigger denial-of-service or access restricted resources on unpatched instances.
A high-severity pre-authentication denial-of-service vulnerability in BeyondTrust Remote Support and Privileged Remote Access caused by insufficient validation of client-supplied input in the network communication subsystem.
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.