CVE-2013-10065

published 2025-08-05

CVE-2013-10065: A denial-of-service vulnerability exists in Sysax Multi-Server version 6.10 via its SSH daemon. A specially crafted SSH key exchange packet can trigger a crash…

Priority P3 51 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

EXPLOIT

A denial-of-service vulnerability exists in Sysax Multi-Server version 6.10 via its SSH daemon. A specially crafted SSH key exchange packet can trigger a crash in the service, resulting in loss of availability. The flaw is triggered during the handling of malformed key exchange data, including a non-standard byte (\x28) in place of the expected SSH protocol delimiter.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
sysax	multi_server	—	—
sysax_software	multi-server	—	—

Detection & IOCs extracted from sources · hover to see the quote

version Sysax Multi-Server 6.10↗

bytes↗

\x28

• → Detect malformed SSH key exchange packets targeting Sysax Multi-Server 6.10 SSHD; look for non-standard byte 0x28 in place of the expected SSH protocol delimiter during key exchange negotiation. ↗
• → A public Metasploit auxiliary module (dos/windows/ssh/sysax_sshd_kexchange) exists for this vulnerability; monitor for its use against SSH services running Sysax Multi-Server. ↗

• · Vulnerability is specific to Sysax Multi-Server version 6.10 SSH daemon; later versions may not be affected by this exact key exchange crash vector. ↗

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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