CVE-2024-35164: The terminal emulator of Apache Guacamole 1.5.5 and older does not properly validate console codes received fr

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MEDIUM 6.8WATCHLISTUPGRADE

CVE-2024-35164 is a medium-severity flaw (CVSS 6.8) affecting guacamole. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The terminal emulator of Apache Guacamole 1.5.5 and older does not properly validate console codes received from servers via text-based protocols like SSH. If a malicious user has access to a text-based connection, a specially-crafted sequence of console codes could allow arbitrary code to be executed with the privileges of the running guacd process. Users are recommended to upgrade to version 1.6.0, which fixes this issue.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-129
Published	2025-07-02
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache

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

Am I affected?

Timeline

2025-07-02 12:15 UTCPublished CVE record published
2026-06-17 07:34 UTCUpdated Record last modified

apache guacamole UPGRADE

Affected: >= 0.8.0 and < 1.6.0

Fixed in: 1.6.0

Safe to downgrade to: a release before 0.8.0

1. Check installed version

apt-cache policy guacamole || rpm -q guacamole || guacamole --version

2. UPGRADE to 1.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade guacamole

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade guacamole

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.8.0 (Debian / Ubuntu)

apt-cache madison guacamole sudo apt install guacamole=<VERSION_BEFORE_0.8.0> sudo apt-mark hold guacamole

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list guacamole sudo dnf downgrade guacamole-<VERSION_BEFORE_0.8.0> sudo dnf versionlock add guacamole

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-2024-35164?

guacamole: upgrade to 1.6.0. Exact commands for each OS are on this page.

Is CVE-2024-35164 being exploited?

CVE-2024-35164 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-2024-35164 affect?

CVE-2024-35164 affects guacamole. Severity is medium (CVSS 6.8). The terminal emulator of Apache Guacamole 1.5.5 and older does not properly validate console codes received from servers via text-based protocols like SSH. If a malicious user has access to a text-based connection, a specially-crafted seque

How urgent is CVE-2024-35164?

Priority 40/100. On your watchlist

References

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