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CVE-2026-2026

Improper Access Control Allows Denial of Service

A vulnerability has been identified where weak file permissions in the Nessus Agent directory on Windows hosts could allow unauthorized access, potentially permitting Denial of Service (DoS) attacks.

CVSS 4.0 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Microsoft Tenable
Products
Windows Agent Nessus Agent
CVE-2019-1559

0-byte record padding oracle

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

CVSS 3.1 · 5.9 Medium EPSS 17.1% KEV · Not listed
Vendors
Canonical Debian F5 and 10 more
Products
Ubuntu Linux Debian Linux Big-ip Access Policy Manager and 88 more