CVE-2013-10065: A denial-of-service vulnerability exists in Sysax Multi-Server version 6.10 via its SSH daemon

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2013-10065 is a high-severity flaw (CVSS 7.5) affecting multi server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-248
Published	2025-08-05
Last modified	2026-06-16

Publisher (CNA): VulnCheck · Vendor: sysax

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-05 20:15 UTCPublished CVE record published
2026-06-16 23:50 UTCUpdated Record last modified

sysax multi server DOWNGRADE

Affected: 6.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.10

1. Check installed version

apt-cache policy multi-server || rpm -q multi-server || multi-server --version

2. No fixed release: DOWNGRADE to a release before 6.10 (Debian / Ubuntu)

apt-cache madison multi-server sudo apt install multi-server=<VERSION_BEFORE_6.10> sudo apt-mark hold multi-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list multi-server sudo dnf downgrade multi-server-<VERSION_BEFORE_6.10> sudo dnf versionlock add multi-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: Sysax Multi-Server 6.10 SSHD Key Exchange Denial of Service

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2013-10065?

multi server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-10065 being exploited?

CVE-2013-10065 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2013-10065 affect?

CVE-2013-10065 affects multi server. Severity is high (CVSS 7.5). 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

How urgent is CVE-2013-10065?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-53459 MEDIUM 5.4 DOWNGRADE Sysax Multi Server 6.99 is vulnerable to Cross Site Scripting (XSS) via the /scgi?sid parameter.
CVE-2024-53458 HIGH 7.5 DOWNGRADE Sysax Multi Server 6.99 is vulnerable to a denial of service (DoS) condition when processing specially crafted
CVE-2023-54337 CRITICAL 9.1 DOWNGRADE Sysax Multi Server 6.95 contains a denial of service vulnerability in the administrative password field that a
CVE-2012-10060 CRITICAL 9.8 UPGRADE Sysax Multi Server versions prior to 5.55 contain a stack-based buffer overflow in its SSH service

References

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