CVE-2024-53459: Sysax Multi Server 6.99 is vulnerable to Cross Site Scripting (XSS) via the /scgi?sid parameter.

Routine

MEDIUM 5.4DOWNGRADE

CVE-2024-53459 is a medium-severity flaw (CVSS 5.4) affecting multi server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sysax Multi Server 6.99 is vulnerable to Cross Site Scripting (XSS) via the /scgi?sid parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-12-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sysax

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-02 16:15 UTCPublished CVE record published
2026-06-17 08:08 UTCUpdated Record last modified

sysax multi server DOWNGRADE

Affected: 6.99

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.99

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 6.99 (Debian / Ubuntu)

apt-cache madison multi-server sudo apt install multi-server=<VERSION_BEFORE_6.99> 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_6.99> 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.

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-2024-53459?

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

Is CVE-2024-53459 being exploited?

CVE-2024-53459 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-2024-53459 affect?

CVE-2024-53459 affects multi server. Severity is medium (CVSS 5.4). Sysax Multi Server 6.99 is vulnerable to Cross Site Scripting (XSS) via the /scgi?sid parameter.

How urgent is CVE-2024-53459?

Priority 30/100. Public exploit reference

Related CVEs

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-2013-10065 HIGH 7.5 DOWNGRADE A denial-of-service vulnerability exists in Sysax Multi-Server version 6.10 via its SSH daemon
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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