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CVE-2021-25631 is a vulnerability in LibreOffice 7.1 before 7.1.2 and 7.0 before 7.0.5 on Windows in which the application's hyperlink-opening protections can be bypassed. LibreOffice used a denylist-based control intended to block dangerous file types when opening links, but an attacker can manipulate a link so that it does not match the denylist while still causing Windows ShellExecute to resolve and launch an executable type. This weakness affects the logic used to validate externally opened links and allows a malicious document hyperlink to evade the blacklist and reach the operating system's URL or file handling mechanism.
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What an attacker gets, and what they’ve been doing with it.
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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.
1 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.