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Slackware 15.0: OpenVPN Important State Exhaustion Issue SSA:2025-323-01

slackware
Calendar Grey November 19, 2025
Dist Slackware Esm H88
New openvpn packages for Slackware 15.0 address security issues in the TLS handshake process. Upgrade recommended.
New openvpn packages are available for Slackware 15.0 and -current to fix security issues

Summary

Here are the details from the Slackware 15.0 ChangeLog: patches/packages/openvpn-2.6.16-i586-1_slack15.0.txz: Upgraded. This update fixes a security issue: Fix memcmp check for the hmac verification in the 3way handshake. This bug renders the HMAC based protection against state exhaustion on receiving spoofed TLS handshake packets in the OpenVPN server inefficient. For more information, see: https://www.cve.org/CVERecord?id=CVE-2025-13086 (* Security fix *)

Topics%20covered

Topics Covered

security advisory important slackware openvpn tls handshake state exhaustion

Where Find New Packages

Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-)
Also see the "Get Slack" section on http://www.slackware.com/ for additional mirror sites near you.
Updated package for Slackware 15.0: ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/openvpn-2.6.16-i586-1_slack15.0.txz
Updated package for Slackware x86_64 15.0: ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/openvpn-2.6.16-x86_64-1_slack15.0.txz
Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openvpn-2.6.16-i686-1.txz
Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openvpn-2.6.16-x86_64-1.txz

MD5 Signatures

Slackware 15.0 package: f3800e33112d44d10d846224eb480e81 openvpn-2.6.16-i586-1_slack15.0.txz
Slackware x86_64 15.0 package: cdaa50283a4666a8833606e3845e4f31 openvpn-2.6.16-x86_64-1_slack15.0.txz
Slackware -current package: 0ad85260fe495647e4cc543207e65905 n/openvpn-2.6.16-i686-1.txz
Slackware x86_64 -current package: d911262d05d67dfc9f0f8f642a87b0f4 n/openvpn-2.6.16-x86_64-1.txz

Severity
important
Lowest
Low
Medium
High
Critical

Topics%20covered

Topics Covered

security advisory important slackware openvpn tls handshake state exhaustion

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Installation Instructions

Installation instructions: Upgrade the package as root: # upgradepkg openvpn-2.6.16-i586-1_slack15.0.txz

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